Burt's solar compass
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Burt's solar compass or astronomical compass/sun compass is a surveying instrument that makes use of the Sun's direction instead of magnetism. William Austin Burt invented his solar compass in 1835. T
William Austin Burt's solar compass
Line illustration of his solar compass from 1836 US patent documentation
Burt's solar compass axes
Marquette Iron Range
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The Marquette Iron Range is a deposit of iron ore located in Marquette County, Michigan. The towns of Ishpeming and Negaunee developed as a result of mining this deposit. A smaller counterpart of Minn
Burt's solar compass
…of iron ore at Negaunee in Marquette County in his later 1844 survey of the upper peninsula of the state of Michigan. This would become known as the Marquette Iron Range. His crew found small deposits of iron ore in the state's lower peninsula at about the same time. His accidental discovery of these iron deposits in…
Lake Superior Iron Ranges
Cliffs Mine on Marquette Range