F. Arnold Surveyor's Vernier Compass

Description
This is an incomplete example (the arms are missing) of an unusual 4–armed instrument. The needle rim is graduated to 30 minutes. The variation scale, at south, extends ± 20 degrees, and is read by vernier to single minutes. The “F. Arnold & Co.” signature refers to Francis Arnold, an immigrant from Frankfurt, Germany, who signed naturalization papers in Philadelphia in 1854. After working briefly for William J. Young, Arnold went into business on his own, advertising as a manufacturer of surveying and engineering instruments. He settled in Chicago around 1860. By 1875, B. Kratzenstein was advertising as Successor to F. Arnold & Co.
Location
Currently not on view
Object Name
surveyor's vernier compass
date made
1850-1875
maker
F. Arnold & Co.
Measurements
dial: 6 3/4 in; 17.145 cm
ID Number
PH*335531
catalog number
335531
accession number
321714
subject
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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