Popular science monthly . The glass part isthreaded to screwinto the rubber 602 Popular Science Monthly Drying Negatives by Heat from aKerosene Lamp THE invention illustrated is a simplelamp heater for (juickly dryingphotographic plates. In the old form oflamp heater, the hot air from the lampis made to circulate in a chamber con-. The hot air passingover the plates isnot exposed to gases taining the [)lates, l)ut this exposes theplates to the gases formed by the com-bustion of the lamp and also to smoke,especially if, as often happens, the lampdoes not burn well. In the new makeup,care is tak
Popular science monthly . The glass part isthreaded to screwinto the rubber 602 Popular Science Monthly Drying Negatives by Heat from aKerosene Lamp THE invention illustrated is a simplelamp heater for (juickly dryingphotographic plates. In the old form oflamp heater, the hot air from the lampis made to circulate in a chamber con-. The hot air passingover the plates isnot exposed to gases taining the [)lates, l)ut this exposes theplates to the gases formed by the com-bustion of the lamp and also to smoke,especially if, as often happens, the lampdoes not burn well. In the new makeup,care is taken that the plates are exposedonly to fresh air. As will be seen, thelamp is placed in the sheet-iron box, butit occui)ies a separate chamber. Thelamp chimney projects up into a tubeportion, and is prevented from over-heating the metal by the use of anasbestos packing. The photographicplates are placed in two inclined cham-bers which open into the lamp action of the lamp causes a suctionin the ui)per tul)e clue to the risingcurrent (jf liot air, and this causes air tobe tirawn into the front opening A. Theair passes up through the two platechambers and out through the fresh air circulates in the iilatechambers. Plates are first put in metalframes and these are slid into racksinside the chamber thro
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
