The principles of perspective as applied to model drawing & sketching from nature (1890)
Trobridge, George, 1851-1909 · London : Cassell · leaf 13
MODEL DB AWING AND FROM NATURE. 9 … Fig. 3. A point on the picture plane exactly position of the natural horizon. It will be opposite to the eye is called the centre of vision ; higher or lower according to the elevation of sometimes, inaccurately, the point of sight. the spectator. Thus a landscape taken from The horizontal line…
Perspective · Drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.