Signedon case: LEEDS & NORTHRUP CO. / PHILADELPHIA / MADE IN U.S.A.
on centering knob: LEEDS & NORTHRUP CO. PHILADELPHIA [with etched "#3" in center]
on storage box, printed on red label: LEEDS & NORTHRUP / 4901 STENTON AVENUE / PHILADELPHIA, PA. / MADE IN U.S.A.
FunctionSuch an instrument is used to measure electric currents.
ProvenanceFrom the Department of Physics, Cruft Laboratory, Harvard University, 12/16/1963.