gy, this conclusion should be extended to embrace as it should be, of pure air. Another practical point mep. blower, by which the powder is distributed at willin greater all the trap ridges of New Jersey. tioned was the importance of keeping the mouth closed ang or smaller quantities, and in a… … 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) The device may also be used…
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