In the so-called “camera lucida”, prisms of the type shown in Figures 104 and 105 are used.
Before the application of photography, the camera lucida was of considerable importance to draughtsmen.
The corpuscles were measured by the ocular micrometer and checked by the aid of a camera lucida.
To which in 1901 he added this note: “What a lot of time I wasted over that camera lucida, to be sure!”
Now remove the cap which fits on the eye-piece, and fix on the camera lucida as shown in the illustration (see Fig. 6).
Place a sheet of drawing paper directly under the camera lucida, sitting as shown in the illustration.
The figures were outlined with camera lucida and drawn on the table, close to the base of the microscope, 100 mm.
The drawings were made with camera lucida and were reduced one-half in making the plates.
He improved and invented the camera lucida, and was the first to demonstrate the identity of galvanism and common electricity.
Other methods, which require the use of the camera lucida, are given in the Micrographic Dictionary.