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Decade: 1860-1869
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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 diffEarly surveyors, like William E. Logan, used Rochon micrometer telescopes and targets …
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 diffEarly surveyors, like William E. Logan, used Rochon micrometer telescopes and targets …
Photograph of Township Reeve.Photograph of Township Reeve.
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