using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object

Full Title

Measuring distances in line of sight; Optical rangefinders (tapes, chains or wheels for measuring length G01B3/00; active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves, G01S17/48) > using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object

Child Classifications

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• G01C 3/28 with provision for reduction of the distance into the horizontal plane