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on a handle. The wheel is placed in contact with the curved line to be measured and run along its length. By counting the number of teeth passing a mark on the handle while this is done, the length of the line can be ascertained:
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111:. Writing in 1881, Morris described how he had created a wholly original name in an attempt to outwit his imitators; he also refused to disclose the origin of the word.
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in 1873 by the
English engineer Edward Russell Morris. The instruments he produced were initially described as a
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91:. Opisometers designed for this purpose provide scales reading the measured distance in kilometers and miles.
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The instrument is most commonly used to measure the lengths of roads, rivers and other line features on
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line length = wheel circumference × teeth counted/teeth on wheel.
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English
Mechanic and World of Science: Vol. 33, London, 1881
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although later versions were sold under the curious name of
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A simple opisometer consists of a toothed wheel of known
151:Scientific Instruments, 1500-1900: An Introduction
80:In more sophisticated models, sometimes called a
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233:Length, distance, or range measuring devices
183:Mathematical Instruments: Map Measurers
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99:Early versions of this instrument were
172:THE LONDON GAZETTE, DECEMBER 12, 1873
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154:, Philip Wilson Publishers 1998,
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149:Gerard L'Estrange Turner,
95:History of the opisometer
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208:at Wikimedia Commons
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126:Steinhaus longimeter
105:Patent Chartometer
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131:Surveyor's wheel
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31:An opisometer
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49:map measurer
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238:Cartography
206:Opisometers
82:chartometer
63:Explanation
227:Categories
217:opisometer
137:References
121:Planimeter
109:Wealemefna
45:meilograph
41:curvimeter
37:opisometer
18:Curvimeter
53:measuring
115:See also
101:patented
57:lengths
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156:ISBN
89:maps
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