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Subject: Rockcliffe now Stonecliffe, Head Township, Renfrew County, ON
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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 …
Three video interviews of Happy Demarco, Stonecliffe. c. 2005Three video interviews of Happy Demarco, Stonecliffe. c. 2005
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