Photographic optics and colour photography [electronic resource] : including the camera, kinematograph, optical lantern, and the theory and practice of image formation (1909)
Johnson, G. Lindsay (George Lindsay), 1853-, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Ward & Co. · leaf 316
PHOTOGRAPHIC OPTICS 276 … Fig. 184. — The same, with adjustable erecting mirror for the projection of transparent objects by transmitted light. \ Fig. 185. — Hughes' Lantern for Opaque Objects. L = lens, 0 = the opaque object, PP = partition screens to cut off direct light from the radiant RR, RR — the two Luna burners.