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/ 13
apparatus for determining the coefficient of expansion of gases by heat

apparatus for determining the coefficient of expansion of gases by heat

E. Leybold Nachfolger
1920-1940
box of galvanometer parts, including mirrors, wire, and terminal block

box of galvanometer parts, including mirrors, wire, and terminal block

Leeds & Northrup Company
1930-1950
bracket to hold reflecting galvanometer scale and telescope

bracket to hold reflecting galvanometer scale and telescope

Leeds & Northrup Company
early 20th Century
bridge testing switch

bridge testing switch

Leeds & Northrup Company
late 19th-early 20th Century
control panel for high vacuum pumping system

control panel for high vacuum pumping system

E. Leybold Nachfolger
ca. 1910-1930
current transformer

current transformer

Leeds & Northrup Company
circa 1910
D'Arsonval wall galvanometer on stand with moving coil

D'Arsonval wall galvanometer on stand with moving coil

Leeds & Northrup Company
circa 1910
decade box resistance

decade box resistance

Leeds & Northrup Company
circa 1948
decade plug resistance box

decade plug resistance box

Leeds & Northrup Company
circa 1938
decade resistance box

decade resistance box

Leeds & Northrup Company
circa 1920
decade resistance box

decade resistance box

Leeds & Northrup Company
1940
decade resistance box

decade resistance box

Leeds & Northrup Company
circa 1914
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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