Signedtop marked: HARTMANN & BRAUN / FRANKFURT A/M / No. 537
Inscribedbottom marked: CHEMICAL LABORATORY / OF HARVARD COLLEGE This apparatus is for use in chemistry 13. Please do not borrow it for any other use without signing a temporary order in the Director's Office.
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 Department of Chemistry, Harvard University.