Ware Solar Compass

Description
This model illustrates the key features of the "Mariner’s Time-Compass" for which Ralph Reeder received an American patent in 1847. The instrument bears the inscription, "Ralph Reeder Patentee, Cincinnati, Ohio. HENRY WARE, MAKER, CINCINNATI, O."
Scientific American reported that this instrument combines "three important uses." It shows "the local variation of the magnetic needle with unerring certainty," "the altitude of the sun, and thus enables the mariner readily to compute latitude." and "the true time" and thus "by the aid of the chronometer, shows the longitude." Despite journal's opinion that Reeder’s instrument "appears to be a practically useful invention," the Mariner’s Time-Compass was not a commercial success. The U.S. Patent Office transferred this model to the Smithsonian in 1926.
Henry Ware (1810-1885) was a leading instrument maker in Cincinnati.
Ref: Ralph Reeder, "Mariner's Time Compass," U.S. Patent #4,964 (1847).
"Improved Nautical Instrument," Scientific American 12 (1856): 4.
Location
Currently not on view
Object Name
mariner's compass
date made
1840s
maker
Henry Ware
Measurements
overall: 15 in x 8 in; 38.1 cm x 20.32 cm
place made
United States: Ohio, Cincinnati
ID Number
PH*309345
catalog number
309345
accession number
89797
patent number
4,964
subject
Measuring & Mapping
Navigation
See more items in
Medicine and Science: Physical Sciences
Navigation
Data Source
National Museum of American History, Kenneth E. Behring Center

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