STUDIES ON THE PHOTOGRAPHING DEVICES OF VARIOUS PROJECTIONS WITH CONVEX MIRRORS

The convex mirrors which are attached to a photographing device and reflect the incident rays in parallel with their axes to give the images of various projection forms have been studied. In the process of the determination of their generating lines, the authors have found that those images are theoretically limited to the Stereographic Projection Form, and the images closely similar to the Equi-Solid Angle Projection Form, the Orthographic Projection Form and the Equi-Distance Projection Form can be made by the suitable convex mirrors which reflect the rays in parallel with their axes. After strict inspections of the relative errors about the images of closely similar projection forms above mentioned, the authors have been convinced that the images of the convex mirrors are useful for the practical purposes, and they are trying to complete a photographing device with the four types of convex mirrors.