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INSTRUMENT MAKING 261
OPERATIVE TECHNICS
A. Instrument Making.
*i. Make from piano wire six smooth broaches.
*2. Make from the same material six hooked extractors.
Fig. 298.—The odontotype. Nos. i and 2.
*3. Perform the exercises on pages 43, 44 and 45 illustrat-
ing Annealing, Hardening and Tempering.
*4. Make from steel blanks six excavators or chisels.
5. Make from annealed brass wire, 13-gauge, the blade
and shank of all the excavators and chisels in the college list.
