THE TELLUROMETER SYSTEM OF DISTANCE MEASUREMENT

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Abstract
The principle of using the transit time of electromagnetic waves for measuring distance for survey purposes is becoming fairly familiar to surveyors. This principle is extensively used for general navigational purposes and navigational equipment, usually in some modified form, has often been used to give measurements of useful accuracy for some survey purposes, particularly over distances of the order of a few hundred miles. Over shorter distances the instrumental accuracy available with such equipment, and propagation difficulties, limit the uses to which it can be adapted.

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