| Time Period Manufactured | Pre-1930 |
|---|---|
| Maker | Gurley |
Check the listing for details. 1928 Gurley Engineering Surveying & Drafting Insts. Catalog/Bulletin. Listed at 50.00 USD. Burt's solar compass. Gurley's original Solar Compass was similar to Burt's improved solar compass. A second form, in which the tangent screws were moved close to their arcs, was introduced in the 1860s.
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