Signedunsigned
Inscribedon outer casing in red paint: 5119
FunctionFor discovery & location of magnetic ore; also to locate iron box covers and pipe lines which are buried out of sight. Held horizontally, serves as ordinary pocket compass.
Primary SourcesPossibility of it being made by Gurley based on:
F. W. Lincoln Jr. & Co. American Engineers & Surveyors , 1870. Etching on page 122.
ProvenanceFrom the Geology Lab, Harvard University, Room 24. Deposited by N.S. Shaker J.B.W. January 25, 1966.
Related WorksSimilar instruments:
Eugene Dietzingen Co. Catalogue, 1921, page 360.
Eugene Dietzingen Co. Catalogue, 1928, page 450.