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 . Bellows- 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 ge
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 . Bellows- 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 int
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