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)

Child Classifications

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• G01C 3/02 Details
• G01C 3/10 using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
• G01C 3/22 using a parallactic triangle with variable angles and a base of fixed length at, near, or formed by the object
• G01C 3/24 using a parallactic triangle with fixed angles and a base of variable length in the observation station, e.g. in the instrument
• G01C 3/26 using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object
• G01C 3/32 by focusing the object, e.g. on a ground glass screen