I have found all the methods for the production of carbon dioxid snow to be extremely unsatisfactory, as with a piece of chamois skin over the vent of the tank nothing could be produced at best but soft snow, which was almost melted by the time one kneaded it into a mold or crayon. Filter-paper tubes and other porous materials gave little satisfaction because of the frequent bursting of the paper, to say nothing of the necessity of swaddling the cone of paper with towels or other insulating materials during the flow of gas from the vent. I found that in the first place tilting of the gas tank to an angle of about 45° gave a sufficient pressure at the vent to insure utilization of all the gas contained in liquid form in the ordinary tank of carbon dioxid, used in drug stores for soda-water charging, which can be
Ahlborn MB. A SIMPLE METHOD FOR MAKING CARBON DIOXID SNOW. JAMA. 1912;LVIII(14):1009–1010. doi:10.1001/jama.1912.04260040025012
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