Practical preventive medicine . e gas should act forat least 8 hours. (b) Sulphur dioxid is a poorer germicide than formaldehyd,but is a good mammalicide and insecticide. It posesses severaldisadvantages, namely it tarnishes and corrodes metals, bleachespigments and rots fabrics. However it is cheap and readilyobtainable. The actual disinfection is accomplished by sul-phurous acid, for whose formation water vapor is attention must be given to humidity conditions,although moisture is not necessary when it is used as an insec-ticide. For disinfecting purposes 5 pounds of s
Practical preventive medicine . e gas should act forat least 8 hours. (b) Sulphur dioxid is a poorer germicide than formaldehyd,but is a good mammalicide and insecticide. It posesses severaldisadvantages, namely it tarnishes and corrodes metals, bleachespigments and rots fabrics. However it is cheap and readilyobtainable. The actual disinfection is accomplished by sul-phurous acid, for whose formation water vapor is attention must be given to humidity conditions,although moisture is not necessary when it is used as an insec-ticide. For disinfecting purposes 5 pounds of sulphur forevery 1000 cubic feet are required. This is equivalent to 5 per DISINFECTANTS AND DISINFECTION IOI cent, of gas, the maximum concentration possible in the every 5 pounds of sulphur employed one pound of watershould be vaporized. It is germicidal in from 6 to 24 the destruction of insects 2 pounds of sulphur per 1000cubic feet are sufficient. It should act from 2 to 12 hourswhen used for this Pig. 9.—For purpose of fumigation all cracks around doors and windows exceptthe door of exit should be sealed with adhesive paper. Sulphur dioxid is most commonly and conveniently generatedby the burning of sulphur. Ordinary stick sulphur is crushedto fineness and the required amount is placed in a conical pile ina shallow cast iron pot or jar, which is supported on bricksin a tub containing 1 to 2 inches of water (Fig. 8). A small 102 PRACTICAL PREVENTIVE MEDICINE conical depression is made in the top of the pile and in this isplaced a small ball of waste saturated with alcohol. Thealcohol is ignited and its burning is sufficient to ignite the sul-phur. It is important that the pots employed be shallow. {c) Preparation oj Quarters jor Fumigation.—All cracksaround doors and windows except the door of exit should be
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