Heliograph
notes: label: Description
content: A heliograph is a simple but effective solar telegraph that signals by flashes of sunlight reflected by a mirror. The form came into widespread use, especially by military forces, in the second half of the nineteenth century. One brass ferrule of this incomplete example is marked: "STAND LAMP or HELLO A MARK III L. A. M."
label: Description
content: Ref: Bausch & Lomb Optical Co., Engineering Instruments (Rochester, N.Y., 1913), p. 142.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.328653
label: catalog number
content: 328653
label: accession number
content: 273378
objectType: label: Object Name
content: heliograph
physicalDescription: label: Measurements
content: overall: 40 in x 2 3/8 in; 101.6 cm x 6.0325 cm
label: Measurements
content: overall: mirrors and bracket: 8 in x 12 1/2 in x 6 1/2 in; 20.32 cm x 31.75 cm x 16.51 cm
label: Measurements
content: overall: sighting vane: 10 1/2 in x 13/16 in x 5/8 in; 26.67 cm x 2.06375 cm x 1.5875 cm
label: Measurements
content: overall: tripod:;