Head, Clara and Maria Local History
Head Township ca.1859


Description
Media Type:
Image
Text
Collection
Item Type:
Maps
Description:
Plan of Head Township dated July 1859.
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
Inscriptions:
Crown Lands Department Toronto. Signed: A. Russell, Assistant Commissioner.
Date of Original:
July 1859
Dimensions:
Width: 27 cm
Height: 20 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.
Copyright Date:
1859
Contact
Head, Clara and Maria Public Library
Email
Head Township ca.1859
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Head Township ca.1859


Plan of Head Township dated July 1859.