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Astronomer James Slemp demonstrating a backstaff

APHP.S1.B.F2.1

James A. Slemp is pictured demonstrating a backstaff. A display case with various scientific instruments in the background. Inscription in black ink on the right side of the photograph reads: J. Slemp - A.P. Astronomer.

One 8 x 10 inch black and white silver gelatin print

Backstaff, Adler Planetarium & Astronomy Museum -- Collection

graphic material

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