Johnson, George Lindsay, 1853- · London : G. Routledge · leaf 274
228 PHOTOGRAPHY IN COLOURS inches clear space below it. This having at least 3 with the fact that the stool top is clearance, together … Fig. 27. quite open between the feet of the microscope, will be explained later. H is a mount holding a small revers- ing prism with silvered hypotenuse at 45 degrees to the two optic axes, and provided with a blackened
Color photography
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
