Leeds & Northrup type 2400 portable galvanometer
date: label: date made
content: ca 1925
name: label: maker
content: Leeds and Northrup Company
notes: label: Description (Brief)
content: A galvanometer housed in a brown wooden box. Used as a submarine telegraph test apparatus. Box is hinged on one end and opens to become the stand for the galvanometer. (The key for the latch is lost and the screws were removed from the catch-plate in order to open the unit.) Unit includes an adjustable telescope (4.25" x 1.25" diameter) with a prism in one end to view 90 degrees from the eye piece. A single calibration line is visible in the viewer. Partial mounting frame for the scope attaches to holes in the box bottom and holds the telescope. Mounting screws and an electrical connector with two binding posts are missing. A scale (1.25" x 6") mounts on the box top for use, inside the box top for storage. Scale is viewed with the eye piece and is marked 0-17 in both directions from the center, red ink to one side, black to the other. Scale reads: "Leeds & Northrup Co."
label: Description (Brief)
content: Reference: Leeds & Northrup company catalog 20, “Galvanometers: Direct Current and ballistic types,” 1921, page 8. Unit also appears on page 10 of the 1927 catalog.
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.330308
label: catalog number
content: 330308
label: accession number
content: 288763
objectType: label: Object Name
content: galvanometer
label: Object Name
content: Telegraph Test Apparatus
label: Object Name
content: test apparatus
label: Other Terms
content: Telegraph Test Apparatus; Test Apparatus; Telegraphy
physicalDescription: label: Physical Description
content: wood (case material)
label: Measurements
content: overall (closed): 4 3/4 in x 4 in x 9 1/4 in; 12.065 cm x 10.16 cm x 23.495 cm