Bussole (from Italian bussola "Büchse") is the name for a special version of magnetic needle instruments or compasses . Below a freely movable magnetic needle in a capsule, they have a horizontally mounted circular dial or a compass rose, divided into 360 degrees and cardinal direction marks .
An inconsistent usage of language equates “Bussole” with a compass in general. Therefore, the term is often applied broadly to the design of compasses with a bearing device . In this sense z. B. a Bussoleninstrument a measuring device equipped with an additional precision compass.
Bussolent theodolites were in use until about 1970 . They are theodolites with built-in full circular bus sols or attachable tubular bus sols that allow a magnetic orientation of less than 0.1 °. Some of the photo theodolites used for expeditions also had these accessories.