Head, Clara and Maria Local History
Map of Head Township


Description
Media Type:
Image
Text
Collection
Item Type:
Maps
Description:
Plan of residence for the township of Head.
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
Dimensions:
Width: 25 cm
Height: 20.5 cm
Map Scale:
40 chains to an inch
Subject(s):
Collection:
Township Collection
Language of Item:
English
Geographic Coverage:
  • Ontario, Canada
    Latitude: 46.15012 Longitude: -77.86622
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 Head Township
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Map of Head Township


Plan of residence for the township of Head.