resistance box
Date1890-1920
Inventory Number0371
ClassificationResistance Box
Subject
Maker
Hartmann & Braun AG
1879 - 1999
User
Department of Chemistry, Harvard University
founded 1791
Cultural Region
Place of Origin
Place of Use
Dimensions10 × 8.8 × 8.8 cm (3 15/16 × 3 7/16 × 3 7/16 in.)
Material
DescriptionA single resistance of 1000 ohms. Simple binding post connectors on brass terminals stops with jack hole for shorting plug between them on hard rubber strip. This in turn mounted on a circular wood cover of cylindrical wood box with 4 vent holes in side. A resistance spool of fine wire (doubtful accuracy) which may have replaced the original one.
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.
Hartmann & Braun AG
Date: 1900-1920
Accessories: plugs (8)
Object number: 1997-1-0399
Hartmann & Braun AG
Date: circa 1920
Accessories: 6 plugs
Object number: 1997-1-0400
