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CLYDE WILLIAM TOMBAUGH - AUTOGRAPH - HFSID 221421

CLYDE W. TOMBAUGH Clyde W. Tombaugh signs an index card in black ink. Signature: "Clyde W. Tombaugh/Discovered 9th planet./Pluto, on 18 Feb 1930/4:00 PM Mst. While scanning/a pair of search plates {23Jan/29Jan/a tricky image shifted 3½ mins.", 5x3 index card. Clyde W.

Sale Price $252.00

Reg. $280.00

Condition: See item description
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CLYDE W. TOMBAUGH
Clyde W. Tombaugh signs an index card in black ink.
Signature: "Clyde W. Tombaugh/Discovered 9th planet./Pluto, on 18 Feb 1930/4:00 PM Mst. While scanning/a pair of search plates {23Jan/29Jan/a tricky image shifted 3½ mins.", 5x3 index card. Clyde W. Tombaugh (1906-1997) was hired in 1929 as an assistant by the Lowell Observatory in New Mexico to continue the search for a planet beyond Neptune, which had been initiated by Percival Lowell. Tombaugh used a blink microscope to compare photographs of a small part of the night sky and detect the planet. After ten months of painstaking comparisons, on February 18, 1930 he found Pluto in the constellation Gemini. Some of his ashes are carried on the New Horizons spacecraft, which is traveling toward Pluto. Fine condition.

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