Heurtley magnifier
date: label: date made
content: ca 1920
name: label: associated person
content: Heurtley, E. S.
label: maker
content: Muirhead & Co. Ltd.
notes: label: Description (Brief)
content: Magnifier for submarine telegraph signals. Nameplate below suspension reads: "Heurtley magnifier / Patent 129140/18 / Muirhead & Co. Ltd." Serial number stamped on left face: 57602; stamped on top of suspension: "50292". Magnifier is mounted on a dark brown metal base (1.5" x 16" x 16"). Magnifier (14" x 14" x 16") is separated into two sections on the base with a black relay box on the back side (7.5" x 6" x 6.5") with terminals on either side. Front section is enclosed in a wood and glass box with hinged doors on front, and left and right sides. Backboard separating the sections is broken. The front section contains the magnifier section and is missing several pieces and wires. Suspension includes the magnifier coil (2.5" x .25") in the center, above that is a mounting arm for very fine wires which are now missing or broken. Ivory(?) scales on front faces and on suspension. Mounted on the base are two brackets holding magnifier units, part of the right unit is missing. Reference: Italo De Giuli, "Submarine Telegraph," SI call number 3 U621.3G. Great Britain Patent 129140, "Improvements in and relating to Magnifying or Relaying Small Mechanical Effects," issued 10 July 1919 to Ernest Sydney Heurtley. (Note: this is the same type as the unit seen in the black & white images, but is a different serial number.)
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from ITT World Communications, Inc., thru John Van Ingen
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.330263
label: catalog number
content: 330263
label: accession number
content: 288763
objectType: label: Object Name
content: Submarine telegraph
label: Object Name
content: submarine telegraph receiver
label: Other Terms
content: Submarine telegraph; Telegraphy
physicalDescription: label: Measurements
content: overall: 14 1/4 in x 15 1/2 in x 16 3/4 in; 36.195 cm x 39.37 cm x 42.545 cm