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resistance secondary standard

resistance secondary standard

Leeds & Northrup Company
circa 1918
resistance secondary standard

resistance secondary standard

Leeds & Northrup Company
circa 1918
resistance secondary standard

resistance secondary standard

Leeds & Northrup Company
circa 1918
resistance secondary standard

resistance secondary standard

Leeds & Northrup Company
circa 1918
resistance secondary standard

resistance secondary standard

Leeds & Northrup Company
circa 1918
resistance secondary standard

resistance secondary standard

Leeds & Northrup Company
circa 1918
resistance standard

resistance standard

Leeds & Northrup Company
circa 1950
resistance standard (0.1 Ohm)

resistance standard (0.1 Ohm)

Otto Wolff
circa 1900
resistance standard (0.1 Ohm)

resistance standard (0.1 Ohm)

Leeds & Northrup Company
1903-c1930
resistance standard (0.01 Ohm)

resistance standard (0.01 Ohm)

Otto Wolff
circa 1903
resistance standard (1 Ohm)

resistance standard (1 Ohm)

Otto Wolff
1900
resistance standard (2 Ohms)

resistance standard (2 Ohms)

Otto Wolff
circa 1903
/ 2

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The Collection of Historical Scientific Instruments
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