ring extensions, draw ■Ing assignments, examinations into the validity ofpatents, etc., special care and attention is given,For information, and for pamphlets of instructionand advice, address MUNN 4: CO.,PUBLISHERS SCIENTIFIC AMERICAN,37 Park Row, New York. OFFICE IN WASHINGTON—comer F and… … HOT DRAFTS FOB STEAM BOILER FURNACES.If cold air be injected into a furnace, it absorbs a largequantity of heat by its great increase of volume by theheat of the furnace; but if the draft be admitted hot, then itis already expanded to a degree corresponding to its increasedtemperature, and…
Patents · Improved · Iron · Consists · June · Sewing machine · Boiler · Perigastric space · Patent system · Scientific American · Second hand · Steam boiler · Postage included · South africa · Specific gravity · Fire box
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