Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . s- Camera. a are united with a central rigid portion rf, by expansible por-tions b b, which are like the bellows of an accordeou. and therebypermit the a(^ljustnient of the distance of the plate from the plate-holder por-tion has also a rocking Fig , so as toallow the face of theplate to be broughtparallel with the gen-eral plane of the
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . s- Camera. a are united with a central rigid portion rf, by expansible por-tions b b, which are like the bellows of an accordeou. and therebypermit the a(^ljustnient of the distance of the plate from the plate-holder por-tion has also a rocking Fig , so as toallow the face of theplate to be broughtparallel with the gen-eral plane of the objectbeing copied. Thegreat advantage of thebellows is of the device fortransportation whencollapsed The bedportion is hinged so aato be doubled up. Fig. 3674 is a stereo-scopic camera used forfield work especially,having an arrange-ment for instantane-ous exposure of thetwo lenses, which ad-nut pencils of beamsto the plates in thebinary chamber. Shut-ters are placed in frontof each tube, so ar-ranged that, by thetouching of a spring,they are simultaneously rotated, of time a hole in each shutter in correspondence with the tube,admitting rays of light from the object to the sensitized surfacesin the Sterroscopic Camera. bringing for an instant PHOTOGRAPHIC CAMERA. 1681 PHOTOGRAPHIC CAMERA. Fig. 3675 is a form of copying and enlarging camera having areflector a for directing the rays into tUe iutvrior, which isshown exposed by letting down the door forming a portion ofthe side. t> is the position of the negative; c, of the lens j d. Fig. 3675.
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
