Harvey Maurice Sachs; Use of the camera lucida to directly label photomicrograph negatives. Journal of Sedimentary Research ; 44 (1): 262–263. doi: https://doi.org/10.1306/74D729EB-2B21-11D7-8648000102C1865D
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By using a camera lucida (drawing tube) positioned below the photo tube, many transmitting or reflected light microscopes may be set up so that all film log information is recorded on the film, eliminating much record-keeping.
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