Signedon top panel: LEEDS & NORTHRUP CO. / PHILADELPHIA / 26010
Inscribedsmall plaque mounted on wooden case: PATENTED / JULY 28, 1914
dials marked: UNITS
FunctionSuch an instrument is used to measure the resistance of electric conductors. For a short general description and other images, go to the following website.
The decade name comes from the fact that the resistance is measured in single units divided in four dials, each a multiple of 10, from 1 to 9999 Ohms.
ProvenanceFrom the Department of Physics, Jefferson Laboratory, Harvard University.