Bottoming File
A file constructed like those shown in Fig. 41, so that it may be used for filing sinks, or other depressions, where an ordinary file cannot be brought into use.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
A file constructed like those shown in Fig. 41, so that it may be used for filing sinks, or other depressions, where an ordinary file cannot be brought into use.