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Médias: Collections- Médias: Images
- Médias: Collections
- Situation géographique: Clara
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- Clara Township Map ca.1885
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 - Map of Clara Township
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 - Plan of the township of Clara, Renfrew County ca. 1888
The Map came from Andre Boissonneault, a contractor. The map is hand written on an oil cloth, and covers a total area of 63922 (unit of measure unknown). Early surveyors, like William E. Logan, used Rochon micrometer telescopes and targets (disk on a calibrated pole) to measure distance. Each microscope … The Map came from Andre Boissonneault, a contractor. The map is hand written on an oil cloth, and covers a total area of 63922 (unit of measure unknown). Early surveyors, …Head, Clara and Maria Public Library
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