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Warner & Swasey
Black and white photograph with caption for two images of a 12-inch equatorial position micrometer (M-48) front and side views. Micrometer built for Philadelphia High School. The caption reads, "The micrometer is an instrument attached to the eye end of a telescope and is intended for measuring the diameter of sun, moon, and planets, the size of sun spots and markings on the planets; the distance of the satellites from their primaries- between two contiguous stars- between a star and planet or between a comet and a contiguous star in order to determine its motion, etc."
8 x 10 in
"No. 28-A" "No. 29-A"
Optical instruments -- Design and constructionMicrometers (Instruments) -- Ohio -- ClevelandOptical industry -- Ohio -- Cleveland -- Photographs