TY - JOUR
AB - SEW ISSTRUIIEKTS camera; for the latter the specimen is placed on the surface and parallel Ivith the axis of the film cylinder at the point IThere the rays emerge from the camera. Tn-o types of radiographs can be taken: (I) with the film on the exterior surface of the camera; (2) with the film pressed in contact ntth the interior of the camera by means of springs. Precision work should alu-ays be carried out in the external position, the film being secured against the surface of the camera by means of clamping plates and screm. In this position the lines of interference can be accurately measured. The advantage offered by- the interior position is that of great breadth (about 2j “.)-a fact of importance in taking texture or fibre diagrams. To focus correctly, the camera, with diaphragms, is placed in the camera holder. X screwd bushing holding a fluorescent screen and cross wires is then screu-ed into position, and since this bushing functions as a ‘‘ sight” the observer is protected by an internal lead-glass shield. By altering the movable arm of the holder the disposition of the camera with respect to the focus of the tube can be 
TI - Siemens humidity meter
JF - Journal of Scientific Instruments
DO - 10.1088/0950-7671/8/12/407
DA - 1931-12-01
UR - https://www.deepdyve.com/lp/iop-publishing/siemens-humidity-meter-cCcllOIbWc
SP - 387
VL - 8
IS - 12
DP - DeepDyve
ER -