![]() In the metalworking field, a divider caliper, popularly called a compass, is used to mark out locations. ![]() " The calipers included a "slot and pin" and "graduated in inches and tenths of an inch." The caliper had an inscription stating that it was "made on the gui-you day, the first day of the first month of the first year of Shijianguo. Ī bronze caliper, dating from 9 AD, was used for minute measurements during the Chinese Xin dynasty. Although rare finds, calipers remained in use by the Greeks and Romans. The wooden piece already featured a fixed and a movable jaw. The ship's find dates to the 6th century BC. The earliest caliper has been found in the Greek Giglio wreck near the Italian coast. In this usage, "caliper" implies only the form factor of the vernier or dial caliper (or its digital counterpart). In machine-shop usage, the term "caliper" is often used in contradistinction to " micrometer", even though outside micrometers are technically a form of caliper. Colloquially these phrases can also refer to dial calipers, although they involve no vernier scale. In colloquial usage, the phrase "pair of verniers" or just " vernier" might refer to a vernier caliper. A single tool might be referred to as a "caliper" or as "calipers", like a pair of scissors or glasses (a "plural only" or plurale tantum form).
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