Signedtop marked: The Leeds & Northrup Co. Philadelphia 17024
Inscribeddial marked: Res. - 10 ohms, inf.- 20 ohms, inf.- 30 ohms, inf. - 40 ohms, 1000's [ohms].
marked: Harvard University 726
scratched on bottom: PROPERTY OF HARVARD ENGINEERING SCHOOL
in pencil on bottom: 4246
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.
ProvenanceFrom the Harvard University Engineering School.