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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.
Every leaf has a 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.