Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction.
A good set of gauges will offer both convex and concave sections, and allow for their application in awkward locations.
Every leave has different radius. The material of the leaves is stainless steel. it is of two types: 1. Internal 2. External. It is used to check the radius of inner and outer surfaces.
- Frane, James T. (1994), Craftsman's Illustrated Dictionary of Construction Terms (Illustrated ed.), Craftsman Book Company, ISBN 978-1-57218-008-6.
- Kennedy, Clifford W.; Hoffman, Edward G.; Bond, Steven D. (1987), Inspection and Gaging (6th, Illustrated ed.), Industrial Press Inc., ISBN 978-0-8311-1149-6.