National Air and Space Museum: The "A" plate used by Clyde Tombaugh

Posted by David Eicher
on Thursday, May 01, 2014

By David J. Eicher

The “A” plate used by Clyde Tombaugh to blink against the “B” plate (which I saw at Lowell Observatory years ago) to discover the planet Pluto in 1930, NASM, Smithsonian Institution, Washington, D.C., April 25, 2014.

Related blog: A visit to the Air and Space Museum

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