Title: Cassegrain focus
Date: 1934
Original Format: photograph: negative
Description: Perspective drawing with observer on swivel swing behind mirror. Pencil on paper, 8 x 12 inches, mounted on board, 9 x 13 inches. Signed R.W.P. and dated 1934. Palomar. Porter Papers.
Caltech Archives ID: RWP2.3-3
