Electric Service Supplies "Keystone" ground fittings
date: label: date made
content: ca 1925
name: label: maker
content: Electric Service Supply Company
notes: label: Description (Brief)
content: Marked: box "Keystone Ground Fittings / for Grounding Radio Receiving Sets / Made by / Electric Service Supplies Co. / Philadelphia Chicago. / Mfgrs. of Lightning Protective Apparatus for 30 Years." A grounding unit consisting of a galvanized malleable iron pipe point and a brass cap. These are designed for use with a six foot section of 1" galvanized iron pipe, which in turn forms one side of a dual grounding arrangement used in conjunction with a lighting arrestor. Price: $0.90 Reference: Pettingell-Andrews Co. Catalog No. 7, (1925-26) page 69. In original box. This is one set with two parts and an enclosed instruction sheet.
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.321916
label: catalog number
content: 321916
label: accession number
content: 241556
objectType: label: Object Name
content: radio component
physicalDescription: label: Measurements
content: point: 3 1/2 in x 1 3/8 in; 8.89 cm x 3.4925 cm
label: Measurements
content: cup: 1 1/8 in x 1 1/2 in x 1 7/8 in; 2.8575 cm x 3.81 cm x 4.7625 cm
label: Measurements
content: box: 1 3/4 in x 4 1/2 in x 2 1/4 in; 4.445 cm x 11.43 cm x 5.715 cm