This archival photograph reproduces a cutaway drawing of the 40-inch telescope, 90-foot dome, and 75-foot elevating floor at Yerkes Observatory, originally published by Warner & Swasey in A Few Astronomical Instruments from the Works of Warner & Swasey, Cleveland, Ohio, U.S.A. (Chasmar-Winchell Press, c.1900), plate XXXIV. The undated 1900 image—drawn from the University of Chicago Photographic Archive—offers a remarkable glimpse into the engineering and architectural innovation behind the world’s largest refracting telescope.
The photograph measures 7.75" × 5.75" and arrives matted to fit a standard 8×10 frame, complete with foam core backing and a protective plastic sleeve. Ready to display, it makes an exceptional addition to any collection celebrating the history of astronomy, engineering, and scientific instrumentation.
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