Wireless Specialty-Murdock type 220 radio signal detector
date: label: date made
content: ca 1919
label: date made
content: ca. 1919
name: label: maker
content: Wireless Specialty Apparatus Co.
label: maker
content: Murdock, William
notes: label: Description (Brief)
content: Marked: "Wireless Specialty Apparatus Co. / Licensors: / Wm. J. Murdock Co., Chelsea, Mass. / Licensees / Molybdenite Pat. Nov. 20, [19]06 / Jan. 21, [19]08 / May 19, [19]08." Crystal detector with swivel cup attached to one binding post. Crystal element is missing. Adjustable pressure control by means of knob-screw mechanism. Original price, $3.00 in 1919. Ref.: Murdock Radio Apparatus Bulletin #19, page 9. (Clark Collection SRM 15-024). No. 220.
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.320885
label: catalog number
content: 320885
label: accession number
content: 241556
objectType: label: Object Name
content: receiver, radio
label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 3 1/4 in x 4 1/2 in x 2 in; 8.255 cm x 11.43 cm x 5.08 cm