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Where cost is not prohibitive, solidified carbon dioxide seems to offer the most flexible and simplest means of generating gas (air) pressure for operating an insecticide spray-gun. It has the advantages of flexibility, minimum operating time per unit sprayed, no adjustings required after initial setting, ease of operation, and fire hazard reduction.
Received June 30, 1941.
1 The observations on which this paper is based were carried out under the auspices and with the support of the International Health Division of The Rockefeller Foundation.
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