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Subject: Grattan, Maria Township
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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 …
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 …
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