an alidade equipped with a compass and two diametrically opposed vertical arms with slits for sighting through.
Origin of circumferentor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for circumferentor
Historical Examples of circumferentor
An improvement which was no doubt introduced at a very early day is the measuring wheel or circumferentor.