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binding posts, part of knife switch

binding posts, part of knife switch

American
late 19th-early 20th Century
bridge key

bridge key

Jules Carpentier
early 20th Century
bridge key for battery and galvanometer circuits

bridge key for battery and galvanometer circuits

American
late 19th-early 20th Century
bridge key for battery and galvanometer circuits

bridge key for battery and galvanometer circuits

American
late 19th-early 20th Century
bridge key with dual key for battery and galvanometer circuits

bridge key with dual key for battery and galvanometer circuits

American
late 19th-early 20th Century
bridge key with dual key for battery and galvonometer circuits

bridge key with dual key for battery and galvonometer circuits

Morris E. Leeds & Company
1899-1903
bridge testing switch

bridge testing switch

Leeds & Northrup Company
late 19th-early 20th Century
contact key

contact key

Central Scientific Company
circa 1910
contactor switch

contactor switch

American
late 19th-early 20th Century
key for resistance bridge

key for resistance bridge

Leeds & Northrup Company
mid 20th Century
key for resistance bridge

key for resistance bridge

Radcliffe College
late 19th-early 20th Century
key-operated switch, S.P.D.T., for electrometer

key-operated switch, S.P.D.T., for electrometer

Fritz Köhler
late 19th-early 20th Century
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