The science of vision; or, Natural perspective ... constituting the basis of the art of design, with ... the new optical laws of the camera obscura, or daguerrèotype, also the physiology of the human eye .. (1840)
Parsey, Arthur · London, Longman & co. · leaf 80
44 THE SCIENCE OF VISION ; OR, THE PERSPECTRONOMETER. To illustrate the principle of foreshortening lines, I have invented an instrument which I have termed the Perspec- tronometer, as shewn by the annexed wood cut. Fig. 1. \ \ . 2. … Fig. 1 represents the instrument, c b is a brass bar revolv- ing on a centre at c ; over which is a steel wire of the same length, with a cock at c ; ad and a e are two thin brass tubes, to represent two visual rays expanding from the point a, or
Perspective
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
