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      Torontonians have a long and happy tradition of heading north to cottage country during the long, hot days of summer. This virtual exhibit explores cottage-related items from our Special Collections.

      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 …