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To the Editor:
—Dr. Sutton's paper in The Journal of Feb. [ill] 1909, describing a mold for carbon dioxid snow, prompts me to call attention to a simple method of obtaining a similar result. For several months I have been using the cylinder of an old hypodermic syringe, end caps removed for the same purpose. The end of the metal container for the glass cylinder fits loosely within the nozzle of the CO2 drum. A ring of rubber tubing, 1/8 inch wide, is slipped over the end of the syringe cylinder, making it fit snugly into the nozzle. The other end is loosely plugged with cotton, the chamois wrapped over, and the whole held with a wooden clamp to prevent the hand from being frost-bitten. The gas is turned on lightly, frost forms on the glass cylinder, then a column of "snow" rapidly fills it from distal end downward.
Hutchins MB. Mold for Carbon Dioxid Snow. JAMA. 1909;LII(10):786–787. doi:10.1001/jama.1909.02540360042013
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