on during the operation, as before stated, so that the emery plate. wheel acts at first on half of the surface to be sharpened, 3, where it will be seen that the support, D, is traversed by and then, on-a half revolution ofthe drill, completes the ope- Fig. 1 gives a view of the machine, which is… … The same mechanism that causes the oscillation of the car- {| its lowér extremity as a center. The oscillatory motion of line 1-2, to allow the mechanism to be seen that is contained rier also effects the rotary oscillation of the bit, through the in the case upon which the too] is mounted. Fig. 2…
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