all the light used In Fig. 2 is shown a simple device for dark ground in this camera enters through a pinhole instead of a lens, a rather longer exposure is required than with illumination. Although it does not take the place of an ordinary camera, but the results obtained are very the parabolic… … vas collector, so that it does not clog the machine. The LONGITUDINAL SECTION OF GLEN CAMERA. places in the world, namely at Annaberg, Saxony, and plates shown in Fig. 4 are extensible, so as to fit almost Redruth, Cornwall, and the scarcity of the mineral has any machine, and are all galvanized.…
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