
A stadimeter is an optical device for estimating the range to an object of known height by measuring the angle between the top and bottom of the object as observed at the device. It is similar to a sextant, in that the device is using mirrors to measure an angle between two objects but differs in that one dials in the height of the object. It is o...
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http://en.wikipedia.org/wiki/Stadimeter

• (n.) A horizontal graduated bar mounted on a staff, used as a stadium, or telemeter, for measuring distances.
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http://thinkexist.com/dictionary/meaning/stadimeter/
Sta·dim'e·ter noun [
Stadium +
-meter .] A horizontal graduated bar mounted on a staff, used as a stadium, or telemeter, for measuring distances.
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http://www.encyclo.co.uk/webster/S/180

an instrument for determining the distance between an observer and an object of known height by measurement of the angle subtended by the object.
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https://www.infoplease.com/dictionary/stadimeter
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