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Many physicians are no doubt deterred from using solidified carbon dioxid pencils for freezing off moles, warts and epitheliomata, by the cost and cumbersomeness of the large tank of liquid carbon dioxid commonly used for making the pencil.
Prest-O-Tire tubes are small steel tubes filled with liquid carbon dioxid, sold for inflating automobile tires. They weigh less than 2 pounds and can be carried in the usual surgical bag. The original cost is but $1.25 and an empty tube may be exchanged for a full one at a cost of 20 cents. They are used with a puncturing valve made by the same manufacturers and costing $2. The total cost of the installation is therefore $3.25; the cost of use is 20 cents for each time used.
To make the pencil of solidified carbon dioxid, remove the connecting tube from the valve proper, tie with string a piece
Boyer GH. A CHEAP AND PORTABLE APPARATUS FOR FORMING CARBON DIOXID PENCILS. JAMA. 1912;LVIII(25):1939–1940. doi:10.1001/jama.1912.04260060288010
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