Results
We found 2 matching items.
Media Types: Collections- Media Types: Publications
- Year: 1886
Page 1 of 1
- Summary Report Of The Operations Of The Geological Survey For The Year 1886
Geological Survey of Canada, 1886 Full text available at Brodie Resource Library Geological Survey of Canada, 1886 Full text available at Brodie Resource LibraryThunder Bay Public Library - Maria Township ca. 1886
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
Page 1 of 1
