Double callipers. These items were often used by woodturners including wheelwrights to capture two diameters. Wheelwrights when turning a wheel hub would have both the narrower hub end diameter and the larger hub belly diameter saved for referral when turning multiple wheels.
CH classification TRADES Wheelwrighting
CH classification TOOLS Tools
L420 X W240 X H2mm
History and use
Double callipers. These are used by woodturners including wheelwrights to capture two different outside diameters. Double callipers would be useful when turning wheel hubs on a lathe. Both the narrower end size and the belly diameter could be held for producing multiple wheels.
The item was donated by wheelwright Mike Hendrikson from Kariong NSW and formerly of Sydney, and was probably acquired around Sydney.