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Media Types Collections   Year 1875  
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  • Map of Clara Township
    Map of Clara Township
    imagetextcollection  Unknown     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 ...
    imagetextcollection  Unknown   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 Head Township
    Map of Head Township
    imagetextcollection  Unknown     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 ...
    imagetextcollection  Unknown   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
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