contact key
Datecirca 1910
Inventory Number0515
ClassificationSwitch
Subject
Maker
Central Scientific Company
1889 - 2000
Cultural Region
Place of Origin
Dimensions9.3 × 8.2 × 12.5 cm (3 11/16 × 3 1/4 × 4 15/16 in.)
Material
DescriptionA spring nickel plated key with one press-to-make contact, also three binding posts. The tips of contact keys are silver plated. Mounted on a hard rubber base.
Signedon base in cursive: Central Scientific Co. / Chicago
FunctionUsed to create and break an electrical circuit. For sensitive electrical measurements.
Morris E. Leeds & Company
Date: 1899-1903
Object number: 0386
Laboratoire de Physique, Faculté Libre de Lille
Date: circa 1885
Object number: DW0092
American
Date: late 19th-early 20th Century
Object number: 0391
Central Scientific Company
Date: circa 1940
Accessories: 2 Leyden condensers made of Pyrex
One rubber **gutta percha?** pulley, rotted.
Object number: 1997-1-0634
American
Date: late 19th-early 20th Century
Object number: 0385
Radcliffe College
Date: late 19th-early 20th Century
Object number: 1998-1-0608
American
Date: late 19th-early 20th Century
Object number: 0390
Fritz Köhler
Date: late 19th-early 20th Century
Object number: 0384
American
Date: late 19th-early 20th Century
Accessories: tilting arm (0380b)
Object number: 0380a
American
Date: late 19th-early 20th Century
Accessories: goes with reversing switch (0380a)
Object number: 0380b