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Usage conditions apply
A heliograph uses sunlight to send signals. This example has two 5-inch diameter mirrors; one has a "HELIO 5 MARK V" inscription on the base. One brass ferrule on the wooden tripod is marked "STAND LAMP or HELLO A MK III P. B. & S. Ltd 1941." This was probably made by Barr & Stroud, Ltd., in Glasgow.
Ref: Bausch & Lomb Optical Co., Engineering Instruments (Rochester, N.Y., 1913), p. 142.
Currently not on view
Object Name
overall: 40 in x 2 3/8 in; 101.6 cm x 6.0325 cm
overall: sighting vane: 10 3/8 in x 1 in x 5/8 in; 26.3525 cm x 2.54 cm x 1.5875 cm
overall: tripod, folded: 39 1/2 in x 3 in x 2 in; 100.33 cm x 7.62 cm x 5.08 cm
overall: mirrors and bracket: 8 in x 12 1/2 in x 6 in; 20.32 cm x 31.75 cm x 15.24 cm
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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