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Title: The Cassegrain Coude Focus
Format: photograph: negative
Date: 1934
Description: Perspective cutaway drawing of observing station built into outrigger trunnion attached to fork mount. Pencil on paper, 12 x 8 inches, mounted on board, 13 x 9 inches. Signed R.W.P. and dated 1934. Palomar. Porter Papers.

Title: The Aluminizing Chamber
Format: photograph: negative
Date: 1934
Description: Perspective drawing of aluminizing chamber with 200-inch mirror. Pencil on paper, 12 x 8 inches, mounted on board, 13 x 9 inches. Signed R.W.P., dated 1934. Palomar. Porter Papers.

Title: At the Prime Focus
Format: photograph: negative
Date: 1934
Description: Perspective cutaway drawing of observer in capsule. Pencil on paper, 8 x 12 inches, mounted on board, 9 x 13 inches. Signed R.W.P. and dated 1934. Palomar. Porter Papers.

Title: At the Cassegrain Focus
Format: photograph: negative
Date: 1934
Description: Perspective drawing with observer on elevator, aluminizing chamber below. Pencil on paper, 8 x 12 inches, mounted on board, 9 x 13 inches. Signed R.W.P., dated 1934. Palomar. Porter Papers.

Title: Cassegrain focus
Format: photograph: negative
Date: 1934
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.

Title: The Cassegrain Coude focus. Alternative.
Format: photograph: negative
Date: 1934
Description: Perspective cutaway drawing of observing station built into trunnion. Pencil on paper, 12 x 9 inches, mounted on board, 13 x 9 inches. Signed R.W.P. and dated 1934. Palomar. Porter Papers.

Title: Looking South
Format: photograph: negative
Date: 1934
Description: Detailed perspective drawing of fork mount with attached cylindrical outrigger trunnions, wishbone staairs around RA axis, and enclosed observer’s cage. Only the cell holder and upper tube ring are actually as built; central tube section is composed of X braces. Pencil on paper, 8 x 12 inches, mounted on board, 9 x 13 inches. Signed R.W.P., dated 1934. Palomar. Porter Papers.

Title: Front half of telescope on fork mount
Format: photograph: negative
Date: 1934
Description: Perspective cutaway drawing of front half of telescope on fork mount with outrigger trunnion tubes. Pencil on paper, mounted on board, 12 x 16 inches. Signed R.W.P., dated 1934. Palomar. Porter Papers.

Title: Fourth International Congress for Applied Mechanics, Cambridge
Format: photograph: negative
Date: 1934
Series: History of Science
Description: Mathematicians - Intern. Congress of Applied Mechanics, 1924, 1934, 1948, 1956

Title: Richard Willstatter
Format: photograph: print
Date: 1934
Series: History of Science
Description: Biochemistry and Chemistry [incl. Individuals; Pasadena Conf. on the Structure of Proteins. 21-25 Sept., 1953]

Title: Cloud chamber photo of possibly a negative proton
Format: photograph: negative
Date: 1934
Description: Considered by Carl Anderson to be too uncertain to publish. Carl Anderson Papers.