Title: Changing Observers at the Prime Focus, 200-inch Telescope
Date: 1936
Original Format: photograph: negative
Description: Perspective drawing showing observers entering and leaving enclosed capsule on spherical truss mount. Pencil, ink and chalk [?] on board, 10.5 x 8.75 inches. Signed R.W. Porter, dated 1936. Palomar. Porter Papers.
Caltech Archives ID: RWP2.3-8
