US3896993A - Process for local modification of the structure of fog and clouds for triggering their precipitation and for hindering the development of hail producing clouds - Google Patents
Process for local modification of the structure of fog and clouds for triggering their precipitation and for hindering the development of hail producing clouds Download PDFInfo
- Publication number
- US3896993A US3896993A US395758A US39575873A US3896993A US 3896993 A US3896993 A US 3896993A US 395758 A US395758 A US 395758A US 39575873 A US39575873 A US 39575873A US 3896993 A US3896993 A US 3896993A
- Authority
- US
- United States
- Prior art keywords
- clouds
- fog
- hail
- sodium alginate
- precipitation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001556 precipitation Methods 0.000 title claims abstract description 18
- 238000011161 development Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 16
- 238000012986 modification Methods 0.000 title description 8
- 230000004048 modification Effects 0.000 title description 8
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000661 sodium alginate Substances 0.000 claims abstract description 32
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 32
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 32
- 239000002245 particle Substances 0.000 claims abstract description 29
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 4
- 239000000047 product Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000006185 dispersion Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 235000010443 alginic acid Nutrition 0.000 description 4
- 229920000615 alginic acid Polymers 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229960001126 alginic acid Drugs 0.000 description 2
- 239000000783 alginic acid Substances 0.000 description 2
- 150000004781 alginic acids Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- JKFYKCYQEWQPTM-UHFFFAOYSA-N 2-azaniumyl-2-(4-fluorophenyl)acetate Chemical compound OC(=O)C(N)C1=CC=C(F)C=C1 JKFYKCYQEWQPTM-UHFFFAOYSA-N 0.000 description 1
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- AEMOLEFTQBMNLQ-BZINKQHNSA-N D-Guluronic Acid Chemical compound OC1O[C@H](C(O)=O)[C@H](O)[C@@H](O)[C@H]1O AEMOLEFTQBMNLQ-BZINKQHNSA-N 0.000 description 1
- AEMOLEFTQBMNLQ-VANFPWTGSA-N D-mannopyranuronic acid Chemical compound OC1O[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H]1O AEMOLEFTQBMNLQ-VANFPWTGSA-N 0.000 description 1
- IAJILQKETJEXLJ-UHFFFAOYSA-N Galacturonsaeure Natural products O=CC(O)C(O)C(O)C(O)C(O)=O IAJILQKETJEXLJ-UHFFFAOYSA-N 0.000 description 1
- 241001466452 Laminariaceae Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 241000199919 Phaeophyceae Species 0.000 description 1
- 229910021612 Silver iodide Inorganic materials 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- AEMOLEFTQBMNLQ-UHFFFAOYSA-N beta-D-galactopyranuronic acid Natural products OC1OC(C(O)=O)C(O)C(O)C1O AEMOLEFTQBMNLQ-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 235000015243 ice cream Nutrition 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229940045105 silver iodide Drugs 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G15/00—Devices or methods for influencing weather conditions
Definitions
- the present invention relates to a process that allows local modification of the structure of fog and clouds, and the triggering of their precipitation.
- the invention also concerns a process that permits the thwarting of the development of hail-producing clouds.
- the purpose of the present invention is to remedy the aforementioned drawbacks, presenting a simple and efficient process that allows both the local modification of the structure of fog and clouds, triggering their precipitation, and the thwarting of the development of hail-producing clouds.
- particulate or powdered hydrophillic substance comprising sodium alginate is dispersed in the fog or in the cloud.
- alginate is a solid product derived from alginic acid (algin) extracted from brown algae called Laminariaceae.
- Alginic acid is a polymer; ized organic compound whose chain is formed from mannuronic acid and guluronic acid in variable proportions.
- Sodium alginate is a cream colored powder, soluble in cold water, forming therewith a colloidal viscous solution and is used mainly in the manufacture of ice cream in which it acts as a stabilizing agent that can prevent the development of large ice crystals (see Merck Index 18th ed., page 31).
- sodium alginate is characterized principally by the property of being hydrophilic, hence of absorbing water in the vapor and liquid phase, when sodium alginate particles are put in suspension in a humidity saturated atmosphere, which is the case with fog and clouds, the particles are able to absorb several times their weight in water. This absorption is explained by the great affinity of sodium alginate for water, which is promoted by the tubular configuration of the macromolecules that constitute it. Similarly, when a liquid water droplet comes into contact with the surface of a sodium alginate particle. it is immediately taken over by the particle. Because of these two processes, the sodium alginate particles increase in size to-become elements loaded with water that can precipitate.
- the sodium alginate has a particle size below microns, on an average 30 microns.
- the sodium alginate particles dispersed in the clouds or in the fog have dimensions close to the droplets constituting the clouds or fog, which allows the particles to remain in suspension in the clouds and fogs for a sufficient period of time so that the absorption in the vapor phase will be as efficient as possible, and so that the probability of contact of the particles with the droplets will be maximal.
- the sodium alginate, in aqueous solution at 1.2 percent by weight, at 18C, having a viscosityabove 600 centipoises is found especially applicable for hindering development of hail-producing clouds. It is known that high turbulence prevails in hail-producing clouds in the course of their development, and that the water droplets that the clouds contain are the seat of a permanent multiplication by chain reaction. The chain reaction process has been described by l. Langmuir in Final report: project cirrus Contract no. W36-039- SC-32427 pages 49-70.
- the dispersion of sodium alginate particles according to the invention with the above mentioned viscosity in the heart of the hailproducing clouds has the effect of inhibiting and braking the process of droplet multiplication.
- the sodium alginate particles by contact with the droplets of the cloud, form drops of viscous solution of dimensions that are clearly larger, being subject to precipitation without division, toward a lower altitude where the risk of congelation, i.e. hail formation, is considerably less. Because they contain sodium alginate, these viscous drops, moreover, have the advantage of solidifying at temperatures below those at which pure water droplets of the same size would congeal; hence the risk of hail formation is further limited.
- FIG. 1 schematically shows the process of the invention for modification and local precipitation of fog
- FIG. 2 shows, as a curve, results of tests made in the framework of the application as illustrated in FIG. 1.
- EXAMPLE I Application to Modification and Triggering of Local Precipitation It is proposed to dissipate locally a blanket of fog 60 to 80 meters thick above an area designated by numeral l in FIG. 1. For this, along a line perpendicular to the direction of the wind component, upstream of area 1 with reference to the direction of the said component (indicated by arrow F) a series of apparatus 2 is disposed, said apparatus being capable of dispersing sodium alginate particles in the atmosphere.
- Apparatus 2 are of a known type comprising a tank for the product that is to be dispersed in the atmosphere and a blower device connected to the tank, communicating with a vertical pipe.
- These apparatus send the powdery product to a height ranging from 4 to 6 meters above the ground.
- the product is entrained toward area 1 by the wind.
- apparatus 2 were disposed at a distance equal to about 400 m from area 1 and the wind velocity was of the order of 2 m/sec.
- Apparatus 2 were moreover separated from each other by about 60 to 80 meters distributed along a front corresponding substantially to that of area 1.
- sodium alginate was used, with a particle size less than 70 microns, averaging 30 microns, and having in a 1.2 percent by weight aqueous solution at 18C a viscosity between 400 and 600 centipoises. This value was determined with a Brook Field R.V.S. viscosimeter.
- the sodium alginate corresponds to a product called Nouralgine F 300 HV 60 (trade mark) sold by Societe Carbonisation et Charbons settling (C.E.C.A.).
- Visibility was recorded in area 1 by means of an IM- PULS (trade mark) videograph before, during and after dispersion of the sodium alginate particles.
- a sodium alginate can be dispersed in the cloud, in 1.2 percent by weight aqueous solution at 18C, with a viscosity of 100 to 400 centipoises, the particle size here being as in the previous example less than microns, averaging 30 microns.
- sodium alginate particles smaller than 70 microns averaging 30 microns, having a viscosity of 600 to 1200 poises in 1.2 percent by weight aqueous solution.
- the sodium alginate particles can be dispersed in hail-producing clouds in the course of development using an airplane equipped with a spray device, the quantity of the dispersed product being of the order of a ton.
- rocket or similar projectile could be used, capable of dispersing the product on part of its trajectory, corresponding to its passage through the cloud.
- sodium alginate to modify the structure of fog and clouds, to trigger precipitation and to hinder formation of hail-producing clouds has the following additional advantages: storing sodium alginate involves no problem, on condition that the product be protected from excessive humidity, which is a distant advantage over sodium chloride or other hygroscopic mineral salts that, to remain finely divided, must be mixed with anticlumping materials;
- sodium alginate has the additional advantage of being much less corrosive, and of not being toxic to plants or animals.
- Another advantage of the invention is that in precipitation of fogs in urban or industrialized areas, there is also precipitation to the ground of liquid and solid pollutants suspended in the fog.
- the invention thereby is a means for combatting pollution.
- a method for locally triggering the precipitation of fog and clouds which comprises dispersing in the fog or clouds, particles of sodium alginate having a viscosity of to 400 centipoises in 1.2 percent by weight aqueous solution at 18C.
- a method for hindering development of hailproducing clouds which comprises dispersing in said clouds particles of sodium alginate having a viscosity of 600 to 1200 centipoises in 1.2 percent by weight solution at 18C.
Abstract
The dispersing of hydrophilic sodium alginate particles in fog and clouds has been found to modify their structure, trigger their precipitation and hinder the development of hail-producing clouds.
Description
United States Patent Serpolay July 29, 1975 PROCESS FOR LOCAL MODIFICATION OF [56] References 'Cited THE STRUCTURE OF FOG AND CLOUDS UNITED STATES PATENTS FOR TRIGGERING THEIR PRECIPITATION 2,052,626 9/1936 Houghtor1,Jr. 239/2 R AND FOR HINDERING THE 3,056,556 10/1962 Sanger et a1. 239/2 R DEVELOPMENT 17 H PRODUCING 3,647,710 3/1972 Stange 239/2 R CLOUDS 3,653,383 4/1972 Wise 260/2096 x Inventor: Roger Rene Serpolay, Brest, France Assignee: Etat Francais, Paris, France Filed: Sept. 10, 1973 Appl. No.: 395,758
Foreign Application Priority Data Primary Examiner-M. Henson Wood, 11'. Assistant Examiner-John J. Love Attorney, Agent, or Firm-Larson, Taylor and Hinds [57] ABSTRACT The dispersing of hydrophilic sodium alginate particles in fog and clouds has been found to modify their structure, trigger their precipitation and hinder the development of hail-producing cloudsv 2 Claims, 2 Drawing Figures PATENTEDJULZQISYS FIG. 2
4h IO IOOm PROCESS FOR LOCAL MODIFICATION OF THE STRUCTURE OF FOG AND CLOUDS FOR TRIGGERING THEIR PRECIPITATION AND FOR HINDERING THE DEVELOPMENT OF HAIL PRODUCING CLOUDS BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process that allows local modification of the structure of fog and clouds, and the triggering of their precipitation. The invention also concerns a process that permits the thwarting of the development of hail-producing clouds.
2. Description of the Prior Art The difficulties inherent in fog are well known, and we know how important it is to be able locally to 'precipitate a sheet of fog e.g. above an airport, to allow takeoff and landing of aircraft. There is also interest in being able to trigger precipitation of clouds so as to hinder development of hail-producing clouds thereby preventing the formation of hail.
Numerous experiments have been carried out to try to resolve these problems. The experiments thus far have consisted principally in dispersing in the fog or clouds particles of a substance that has the property of condensing or absorbing the water of the microscopic droplets which constitute the fog or clouds. It was hoped that in this way that the fine water droplets, with an average size of 5 to microns, constituting the fog and clouds, could be replaced by a smaller number of larger particles that could be precipitated.
Thus experiments have been conducted involving the dispersion of microcrystals of ice or of substances such as silver iodide in supercooled clouds or fog, i.e., formed in air at a temperature below 0C. Using these known procedures, supercooled fogs and clouds have been precipitatable as snow.
Attempts to precipitate natural fog formed at temperatures above 0C have made use of hygroscopic substances such as sodium chloride. The results of these attempts were inconclusive and generally negative in the situation where the fog sheet has a thickness of the order of or less than several tens of meters.
Similarly, experiments so far aimed at prevention of development of hail-producing clouds have not yielded significant results.
SUMMARY OF THE INVENTION The purpose of the present invention is to remedy the aforementioned drawbacks, presenting a simple and efficient process that allows both the local modification of the structure of fog and clouds, triggering their precipitation, and the thwarting of the development of hail-producing clouds.
According to the process of the invention, particulate or powdered hydrophillic substance comprising sodium alginate is dispersed in the fog or in the cloud.
It is known that sodium alginate is a solid product derived from alginic acid (algin) extracted from brown algae called Laminariaceae. Alginic acid is a polymer; ized organic compound whose chain is formed from mannuronic acid and guluronic acid in variable proportions.
Sodium alginate is a cream colored powder, soluble in cold water, forming therewith a colloidal viscous solution and is used mainly in the manufacture of ice cream in which it acts as a stabilizing agent that can prevent the development of large ice crystals (see Merck Index 18th ed., page 31).
Since sodium alginate is characterized principally by the property of being hydrophilic, hence of absorbing water in the vapor and liquid phase, when sodium alginate particles are put in suspension in a humidity saturated atmosphere, which is the case with fog and clouds, the particles are able to absorb several times their weight in water. This absorption is explained by the great affinity of sodium alginate for water, which is promoted by the tubular configuration of the macromolecules that constitute it. Similarly, when a liquid water droplet comes into contact with the surface of a sodium alginate particle. it is immediately taken over by the particle. Because of these two processes, the sodium alginate particles increase in size to-become elements loaded with water that can precipitate.
According to a preferred embodiment of the invention, the sodium alginate has a particle size below microns, on an average 30 microns. Thus the sodium alginate particles dispersed in the clouds or in the fog have dimensions close to the droplets constituting the clouds or fog, which allows the particles to remain in suspension in the clouds and fogs for a sufficient period of time so that the absorption in the vapor phase will be as efficient as possible, and so that the probability of contact of the particles with the droplets will be maximal.
According to another preferred embodiment of the invention the sodium alginate, in aqueous solution at 1.2 percent by weight, at 18C, having a viscosityabove 600 centipoises is found especially applicable for hindering development of hail-producing clouds. It is known that high turbulence prevails in hail-producing clouds in the course of their development, and that the water droplets that the clouds contain are the seat of a permanent multiplication by chain reaction. The chain reaction process has been described by l. Langmuir in Final report: project cirrus Contract no. W36-039- SC-32427 pages 49-70. The dispersion of sodium alginate particles according to the invention with the above mentioned viscosity in the heart of the hailproducing clouds has the effect of inhibiting and braking the process of droplet multiplication. Without the invention being bound to this explanation, it appears the sodium alginate particles, by contact with the droplets of the cloud, form drops of viscous solution of dimensions that are clearly larger, being subject to precipitation without division, toward a lower altitude where the risk of congelation, i.e. hail formation, is considerably less. Because they contain sodium alginate, these viscous drops, moreover, have the advantage of solidifying at temperatures below those at which pure water droplets of the same size would congeal; hence the risk of hail formation is further limited.
Other details of the invention will become evident from the following description.
There are described below several non-limiting examples which refer to different applications of the process of the invention.
DESCRIPTION OF THE DRAWINGS In the attached drawings:
FIG. 1 schematically shows the process of the invention for modification and local precipitation of fog;
FIG. 2 shows, as a curve, results of tests made in the framework of the application as illustrated in FIG. 1.
The following examples are included to further illustrate the present invention.
EXAMPLE I Application to Modification and Triggering of Local Precipitation It is proposed to dissipate locally a blanket of fog 60 to 80 meters thick above an area designated by numeral l in FIG. 1. For this, along a line perpendicular to the direction of the wind component, upstream of area 1 with reference to the direction of the said component (indicated by arrow F) a series of apparatus 2 is disposed, said apparatus being capable of dispersing sodium alginate particles in the atmosphere.
These apparatus send the powdery product to a height ranging from 4 to 6 meters above the ground. The product is entrained toward area 1 by the wind.
In the test example, apparatus 2 were disposed at a distance equal to about 400 m from area 1 and the wind velocity was of the order of 2 m/sec.
In this test example, sodium alginate was used, with a particle size less than 70 microns, averaging 30 microns, and having in a 1.2 percent by weight aqueous solution at 18C a viscosity between 400 and 600 centipoises. This value was determined with a Brook Field R.V.S. viscosimeter.
The sodium alginate corresponds to a product called Nouralgine F 300 HV 60 (trade mark) sold by Societe Carbonisation et Charbons actifs (C.E.C.A.).
Two hundred and fifty kg of this product were dispersed in the course of 6 minutes at a rate of the order of 8 kg/min per apparatus 2, and the following observations were made:
It was found that in area 1, a short time after the start of product dispersion, there was precipitation of large particles with a diameter greater than 100 microns, and at the same time it was noted that there was a considerable increase in visibility in area 1.
Visibility was recorded in area 1 by means of an IM- PULS (trade mark) videograph before, during and after dispersion of the sodium alginate particles.
The curve thus recorded and reproduced in FIG. 2 gives on the ordinates, visibiility V in meters and on the abscissa, time t. This curve C shows that the visibility, originally about 300 m, rapidly increased to 600 m, 6 to 7 minutes after instant A when product dispersion started. Visibility then decreased, to return to its original value several minutes after instant B, corresponding to the end of product dispersion.
When visibility returned to its initial value, it was noted that the large particles in the fog has disappeared.
These observations, together with the fact that the elapsed time between instant A when the dispersion of the product began and the instant when visibility reached its maximum corresponded rather exactly with the time the sodium alginate particles took to travel the distance between apparatus 2 and area 1, do not leave room for any doubt as to the effective action of the so dium alginate particles on the fog.
EXAMPLE II Application to the Triggering of Cloud Precipitation For such an application, a sodium alginate can be dispersed in the cloud, in 1.2 percent by weight aqueous solution at 18C, with a viscosity of 100 to 400 centipoises, the particle size here being as in the previous example less than microns, averaging 30 microns.
1n the case of a Cumulus cloud in contact with a mountain peak, means for dispersion can be the same as those in the previous example. However, use would generally be made of an airplane with a spray system similar to that used in agriculture for dusting.
Excellent results can be obtained by thus dispersing quantities of 50 to 200 kg sodium alginate during periods that range from 10 to 30 minutes.
EXAMPLE III Application to Modification of Hail Producing Clouds It is proposed to act ahead of time on the development of a hail-producing cloud, to prevent formation of hail. In such an application, it is indispensable to be able to replace the original water droplets with very viscous, larger drops.
For this, there is provided use of sodium alginate particles smaller than 70 microns, averaging 30 microns, having a viscosity of 600 to 1200 poises in 1.2 percent by weight aqueous solution.
The sodium alginate particles can be dispersed in hail-producing clouds in the course of development using an airplane equipped with a spray device, the quantity of the dispersed product being of the order of a ton.
It is likewise conceivable that a rocket or similar projectile could be used, capable of dispersing the product on part of its trajectory, corresponding to its passage through the cloud.
Use of sodium alginate to modify the structure of fog and clouds, to trigger precipitation and to hinder formation of hail-producing clouds has the following additional advantages: storing sodium alginate involves no problem, on condition that the product be protected from excessive humidity, which is a distant advantage over sodium chloride or other hygroscopic mineral salts that, to remain finely divided, must be mixed with anticlumping materials;
with reference to many mineral salts, sodium alginate has the additional advantage of being much less corrosive, and of not being toxic to plants or animals.
Another advantage of the invention is that in precipitation of fogs in urban or industrialized areas, there is also precipitation to the ground of liquid and solid pollutants suspended in the fog. The invention thereby is a means for combatting pollution.
It is claimed:
1. A method for locally triggering the precipitation of fog and clouds which comprises dispersing in the fog or clouds, particles of sodium alginate having a viscosity of to 400 centipoises in 1.2 percent by weight aqueous solution at 18C.
2. A method for hindering development of hailproducing clouds which comprises dispersing in said clouds particles of sodium alginate having a viscosity of 600 to 1200 centipoises in 1.2 percent by weight solution at 18C.
Claims (2)
1. A METHOD FOR LOCALLY TRIGGERING THE PRECIPITATION OF FOG AND CLOUDS WHICH COMPRISES DISPERSING IN THE FOG OR CLOUDS, PARTICLES OF SODIUM ALGINATE HAVING A VISCOSITY OF 100 TO 400 CENTIPOSES IN 1.2 PERCENT BY WEIGHT AQUEOUS SOLUTION AT 180*C.
2. A method for hindering development of hail-producing clouds which comprises dispersing in said clouds particles of sodium alginate having a viscosity of 600 to 1200 centipoises in 1.2 percent by weight solution at 18*C.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7232687A FR2199565B1 (en) | 1972-09-15 | 1972-09-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3896993A true US3896993A (en) | 1975-07-29 |
Family
ID=9104304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US395758A Expired - Lifetime US3896993A (en) | 1972-09-15 | 1973-09-10 | Process for local modification of the structure of fog and clouds for triggering their precipitation and for hindering the development of hail producing clouds |
Country Status (4)
Country | Link |
---|---|
US (1) | US3896993A (en) |
DE (1) | DE2344789A1 (en) |
FR (1) | FR2199565B1 (en) |
GB (1) | GB1403677A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5441200A (en) * | 1993-08-20 | 1995-08-15 | Rovella, Ii; Ernest J. | Tropical cyclone disruption |
US6315213B1 (en) * | 2000-06-21 | 2001-11-13 | Peter Cordani | Method of modifying weather |
US20040134997A1 (en) * | 2001-12-25 | 2004-07-15 | Alexander Khain | Method and apparatus for controlling atmospheric conditions |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3247607A1 (en) * | 1982-12-23 | 1984-07-05 | Zbigniew Dr. 6078 Neu-Isenburg Boguslawski | METHOD FOR REMOVING FOG FROM THE ATMOSPHERA |
DE3344809A1 (en) * | 1983-12-12 | 1985-06-13 | Zbigniew Dr. 6078 Neu-Isenburg Boguslawski | METHOD AND DEVICE FOR REMOVING FOG FROM THE ATMOSPHERA |
GB2186781A (en) * | 1986-02-25 | 1987-08-26 | Ying Cheung Chee | Influencing meteorological phenomena |
GB2436197A (en) * | 2006-03-14 | 2007-09-19 | Gen Applic For Special Materia | Neutralisation of strong winds |
GB0921879D0 (en) * | 2009-12-15 | 2010-01-27 | Davidson Technology Ltd | Atmospheric delivery system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2052626A (en) * | 1933-06-05 | 1936-09-01 | Massachusetts Inst Technology | Method of dispelling fog |
US3056556A (en) * | 1955-05-12 | 1962-10-02 | Mach Tool Works Oerlikon Admin | Method of artificially influencing the weather |
US3647710A (en) * | 1970-02-10 | 1972-03-07 | Fmc Corp | Method for dispersing fog with phosphate salt compositions |
US3653383A (en) * | 1969-07-30 | 1972-04-04 | Freeze Dry Products | Algin sponge and process therefor |
-
1972
- 1972-09-15 FR FR7232687A patent/FR2199565B1/fr not_active Expired
-
1973
- 1973-08-24 GB GB4033473A patent/GB1403677A/en not_active Expired
- 1973-09-05 DE DE19732344789 patent/DE2344789A1/en active Pending
- 1973-09-10 US US395758A patent/US3896993A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2052626A (en) * | 1933-06-05 | 1936-09-01 | Massachusetts Inst Technology | Method of dispelling fog |
US3056556A (en) * | 1955-05-12 | 1962-10-02 | Mach Tool Works Oerlikon Admin | Method of artificially influencing the weather |
US3653383A (en) * | 1969-07-30 | 1972-04-04 | Freeze Dry Products | Algin sponge and process therefor |
US3647710A (en) * | 1970-02-10 | 1972-03-07 | Fmc Corp | Method for dispersing fog with phosphate salt compositions |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5441200A (en) * | 1993-08-20 | 1995-08-15 | Rovella, Ii; Ernest J. | Tropical cyclone disruption |
US6315213B1 (en) * | 2000-06-21 | 2001-11-13 | Peter Cordani | Method of modifying weather |
US20040134997A1 (en) * | 2001-12-25 | 2004-07-15 | Alexander Khain | Method and apparatus for controlling atmospheric conditions |
Also Published As
Publication number | Publication date |
---|---|
FR2199565A1 (en) | 1974-04-12 |
DE2344789A1 (en) | 1974-03-21 |
FR2199565B1 (en) | 1975-03-14 |
GB1403677A (en) | 1975-08-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2052626A (en) | Method of dispelling fog | |
US3896993A (en) | Process for local modification of the structure of fog and clouds for triggering their precipitation and for hindering the development of hail producing clouds | |
EP0375741B1 (en) | The use of a fire-extinguishing means | |
US3984334A (en) | High internal phase ratio emulsion fire extinguishing agent | |
US2802303A (en) | Erosion control | |
CA1086602A (en) | Process for producing dense clouds for the purpose of camouflage | |
US3608810A (en) | Methods of treating atmospheric conditions | |
US4037665A (en) | Fire extinguisher containing a high internal phase ratio emulsion as fire extinguishing agent | |
US3659785A (en) | Weather modification utilizing microencapsulated material | |
US3900391A (en) | Method of making a pumpable slurry from waxy crude oil | |
US3608820A (en) | Treatment of atmospheric conditions by intermittent dispensing of materials therein | |
US2908442A (en) | Method for dispersing natural atmospheric fogs and clouds | |
US1619183A (en) | Process of producing smoke clouds from moving aircraft | |
US4362271A (en) | Procedure for the artificial modification of atmospheric precipitation as well as compounds with a dimethyl sulfoxide base for use in carrying out said procedure | |
US3108075A (en) | Formamide mixtures as de-icing materials | |
DE563170C (en) | Atomizing device for pest control | |
US3285718A (en) | Method of solidifying liquid fuel and product thereby obtained | |
DE2433472A1 (en) | IMPROVED PROCESS FOR PUMPING WAXY CRUDE OIL | |
US3647710A (en) | Method for dispersing fog with phosphate salt compositions | |
US1784157A (en) | Process and apparatus for atomizing materials from moving aircraft | |
US3806348A (en) | Fog dispersing compositions | |
CH531099A (en) | Fog dispersing/rain making compsn | |
WO2003009671A1 (en) | Method for dispersing fog and/or clouds | |
DE1534176A1 (en) | Spreading material for roughening and thawing icy roads | |
CN105903427B (en) | A kind of cold clouds for being used to mitigate haze |