A heliostat throws sunlight where it might be used for photography or scientific observations. This unsigned example consists of a rectangular mirror with rounded corners that is mounted in a metal frame and supported on a tri-leg base. It has no clockwork, but it does have tangent screws for turning the mirror around its vertical and horizontal axes. Several manufacturers offered “laboratory heliostats” of this general design.
Ref. Société Genevoise, Illustrated Price List of Physical and Mechanical Instruments (Geneva, 1900), item 2120, pp. 85-86.
Max Kohl, Price List No. 50, Vol. 1 (Chemnitz, n.d.), pp. 34-35.
Currently not on view
Object Name
date made
ca 1900
Duboscq, Jules
overall: 23 1/2 in; 59.69 cm
mirror: 14 in x 8 in; 35.56 cm x 20.32 cm
ID Number
accession number
catalog number
Science & Scientific Instruments
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Military Academy
Additional Media

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