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:hcmhistory@gmail.com
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Map of Head Township


Plan of residence for the township of Head.