Popular science monthly . Two effective methods of removingclose-fitting bushings in fixtures and jigs remoAing the bushing is shown at B. Avery effective way is shown at C. whereinoil is run in the hole and a close-fitting plugor plunger driven in with a hammer. Thecompress oil forces the bushing out andthere is no danger of damage being doneto the parts.—A. H. Wadell. 934 Popular Science Monthly A Dark-Room Lamp to Be UsedUnder a Glass Tray THE lump illuslrated is a very handyinstrument for developing platesand films. It consists of a light-tightwood box A containing a small lamp Band a reHe
Popular science monthly . Two effective methods of removingclose-fitting bushings in fixtures and jigs remoAing the bushing is shown at B. Avery effective way is shown at C. whereinoil is run in the hole and a close-fitting plugor plunger driven in with a hammer. Thecompress oil forces the bushing out andthere is no danger of damage being doneto the parts.—A. H. Wadell. 934 Popular Science Monthly A Dark-Room Lamp to Be UsedUnder a Glass Tray THE lump illuslrated is a very handyinstrument for developing platesand films. It consists of a light-tightwood box A containing a small lamp Band a reHector C. The size of the ruby-6. A and should be glued to that reasonable care the batteries willlast at least a \ear and the amateurphotographer will find that the negativesare far better developed in this films can be developed in the samemanner as plates by attaching them to aglass plate of the same size as the film,using rubber bands to hold it closely tothe plate surface.—V. A. The developing tray of glass is placedon top of the ruby glass of the lamp glass D depends upon the size of theplates used. There are two dry bat-teries E, about 6 in. long by 2 in. indiameter which supply the current forthe lamp. The circuit is opened orclosed by the switch F. Two woodblocks H keep the batteries E in theirproper place and support the reflector developing dish must be of glass andis placed on the ruby glass D. The dryplate or film is then put in the dish, thedeveloper poured on and after abouthalf a minute the lamp B on for a few seconds. Without 1the plate out of the dish onejudge
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
