9 power flash telescope
date: label: date made
content: ca 1918
label: date made
content: ca. 1918
notes: label: Description (Brief)
content: Metal plate on unit stamped: "Flash-Telescope. Power 9, 6-8 Volts. Major R. W. Wood". Piece of black-painted vent pipe with a glass lens mounted in one end, and an brass plate with two electrical contacts, adjustment knob, and lamp socket on the other end. Wire stub emerges from back of socket on side of tube near brass plate. A tipped G-shaped incandescent lamp is mounted inside, behind what appears to be a filter. The brass plate is held in place with screws and would have to be removed to change the lamp. The outside of the tube around the lens is threaded, and a rack coaxial to the focal length is pressed into the metal just behind the threads. See Wood's US patent 1346580, "Flash Telescope," issued 13 July 1920; and US 1517332, "Signaling System," issued 2 December 1924.
label: Description (Brief)
content: Donor was Robert Williams Wood (1868-1955), professor of optics at Johns Hopkins University (1901-1955). Inventor of "Wood's glass," a material transmissive of infrared and ultraviolet radiation used in military signaling devices during World War I.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Robert W. Wood
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.317948.01
label: accession number
content: 232066
label: catalog number
content: 317948.01
objectType: label: Object Name
content: Tube, Dipcrasite
label: Object Name
content: dyscrasite tube
label: Object Name
content: photoelectric cell
label: Object Name
content: telescope
label: Other Terms
content: Tube, Dipcrasite; Components; Optical Devices
physicalDescription: label: Measurements
content: tube: 23 1/2 in x 4 1/2 in; 59.69 cm x 11.43 cm