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Media Types: Collections- Media Types: Collections
- Media Types: Texts
- Year: 1859
- Creative Commons : by-nc-nd
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- Head Township ca.1859
Early surveyors, like William E. Logan, used Rochon micrometer telescopes and targets (disk on a calibrated pole) to measure distance. Each microscope had a different calibration and therefore a different range. The instruments were calibrated against a distance measured with a surveyors chain (also known as Gunter’s chain). One chain … Early surveyors, like William E. Logan, used Rochon micrometer telescopes and targets (disk on a calibrated pole) to measure distance. Each microscope had a different calibration and therefore a different …Head, Clara and Maria Public Library - Vaughan Estate Auction
This is an original poster with the announcement of Vaughan Estate Auction at Mr. George Simpson's Hotel at Richmond Hill, ON, on Tuesday, October 11, 1859. This is an original poster with the announcement of Vaughan Estate Auction at Mr. George Simpson's Hotel at Richmond Hill, ON, on Tuesday, October 11, 1859.Richmond Hill Public Library
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