Head, Clara and Maria Local History
Map of Clara Township


Description
Media Type:
Image
Text
Collection
Item Type:
Maps
Description:
Plan for the Township of Clara
Notes:
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 had 100 links and was 66 feet (about 20 meters) or 22 yards long.

Sources
William E. Logan (2007). 1845 Survey of the Upper Ottawa Valley. Mercury Series History Paper 54. Charles H. Smith and Ian Dyck (eds.). Gatineau, Quebec: Canadian Museum of Civilization Corporation.

surveyor’s chain. (2010). In Encyclopædia Britannica. Retrieved April 14, 2010, from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/575448/surveyors-chain
Date of Original:
Unknown
Map Scale:
40 chains to an inch
Subject(s):
Collection:
Township Collection
Language of Item:
English
  • Ontario, Canada
    Latitude: 46.20012 Longitude: -78.31624
Creative Commons licence:
by-nc-nd [more details]
Copyright Statement:
Public domain: Copyright has expired according to Canadian law. No restrictions on use.
Contact
Head, Clara and Maria Public Library
Email
Map of Clara Township
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Map of Clara Township


Plan for the Township of Clara