transit declinometer
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transit declinometer
[′trans·ət ‚dek·lə′näm·əd·ər] (engineering)
A type of declinometer; a surveyor's transit, built to exacting specifications with respect to freedom from traces of magnetic impurities and quality of the compass needle, has a 17-power telescope for sighting on a mark and for making solar and stellar observations to determine true directions.