nasmuch as all the light used be carried on comfortably for an hour or more. in this camera enters through a pinhole instead of a In Fig. 2isshown a simple device for dark ground lens, a rather longer exposure is required than with illumination. Although it does not take the place of an ordinary… … 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. This collector is The construction of the camera will be…
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