y, this conclusion should be extended to embrace as it should be, of pure air. Another practical point men- blower, by which the powder is distributed at will in greater all the trap ridges of New Jersey. or smaller quantities, and in a minute jet wherever desired. tioned was the importance of… … asserted that more heat goes through the roof than through The matter has been fully discussed and a variety of theo- INSECT POWDER BLOWER. the walls. ries suggested, against which an equal number of objections We are informed that scientific tests (Franklin Institute) have been made. Dr. Bell's…
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