Aluminized Mirror

Aluminized Mirror

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John Donovan Strong, a young physicist at the California Institute of Technology, was one of the first to coat a mirror with aluminum by thermal vacuum evaporation. This example, which dates from 1931-1932, is his first, and also the earliest known example of a telescope mirror of this sort. Strong’s technique was quickly adopted by both professional and amateur astronomers.
Ref: David Devorkin, "John Strong's First Aluminized Mirror," Rittenhouse 2 (1987): 1-10.
Currently not on view
Object Name
Mirror, Astronomical, Aluminized
date made
overall: 2.36 cm x 15.64 cm; 15/16 in x 6 3/16 in
overall in case: 3 1/4 in x 9 1/2 in x 9 1/2 in; 8.255 cm x 24.13 cm x 24.13 cm
ID Number
accession number
catalog number
Credit Line
Jack Howard Taylor
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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