Murdock type 344 loose coupler
date: label: date made
content: ca 1916
name: label: maker
content: Murdock Radio Co.
notes: label: Description (Brief)
content: Murdock type 344 receiving transformer or "loose coupler". Nameplate reads: "Wm. J. Murdock Co. / Chelsea, Mass. / San Francisco". Unit is an early loose coupler with a movable secondary that slides in and out of the primary winding, thus varying radio frequency coupling. A slider varies inductance of primary, and a multi-point switch varies secondary inductance. Binding posts are located on the frame and primary slider. Manufacturer claimed wavelength range to 1500 meters. Reference: Murdock Catalog No. 15 (1915 or 1916), page 10.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320926
label: accession number
content: 241556
label: catalog number
content: 320926
objectType: label: Object Name
content: receiving transformer
physicalDescription: label: Measurements
content: overall: 6 1/2 in x 12 in x 4 in; 16.51 cm x 30.48 cm x 10.16 cm