Other makers soon followed, but before long the firm of W. Click here to view a revolving telescopic solar compass.įollowing its invention, the first of the Burt Solar Compasses were produced by Wm. Another example of a Gurley Telescopic Solar compass can be viewed from different angles using Quick Time software. Click here for information on the invention of the instrument. Click here to view the Smithsonian's Gurley Telescopic Solar Compass The National Museum also provides additional historical information on the invention of the solar compass. Geological Survey that appears the same as this example.
The Smithsonian Museum has a Gurley telescopic solar compass acquired from the U.S. Other private surveyors and government agencies also used the combination. Their combination of solar compass with the telescope attachment met the government standard. Gurley had already been producing a telescope attachment for its sight vane instruments based upon its 1878 patent. According to a July-1900 Gurley catalog, the government applied this ruling so that a solar compass with telescope attachment fulfilled that requirement.
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Beginning with the 1890 USGLO manual of surveying instructions, the government directed that the important (principal) public land lines must be surveyed with the transit. This instrument takes Burt's invention one step further. Burt's solar compass uses a mechanical apparatus that accurately determines the true north-south direction from the sun's position in the sky. He designed it for surveying government public lands as a replacement for the ever-troublesome magnetic needle compass. The solar compass was invented by William A. Because of its great scarcity it is most often the featured instrument in any collection of historical surveying instruments. The Burt's Solar Compass is one of the most important surveying instruments in American history. This is a splendid example of a highly sought-after surveying instrument
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