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CLYDE WILLIAM TOMBAUGH - COMMEMORATIVE COVER SIGNED - HFSID 253091

CLYDE W. TOMBAUGH Clyde W. Tombaugh signs a commemorative envelope honoring the 1930 International Aircraft Show with his discovery of Pluto. Commemorative envelope signed: "Clyde W. Tombaugh/Discovered 9th planet/Pluto, on 18 Feb.

Sale Price $337.50

Reg. $375.00

Condition: See item description
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CLYDE W. TOMBAUGH
Clyde W. Tombaugh signs a commemorative envelope honoring the 1930 International Aircraft Show with his discovery of Pluto.
Commemorative envelope signed: "Clyde W. Tombaugh/Discovered 9th planet/Pluto, on 18 Feb. 1930", 6½x3½, honoring the 1930 International Aircraft Show, postmarked Saint Louis, Missouri, February 18, 1930. 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. Lightly worn at edges. Collectors address at lower right. Otherwise, fine condition.

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