. Catalogue of dental materials, furniture, instruments, etc., for sale . he hand-piece. By an almost automatic or instinctivemovement of the thumb of the operator, the collar is movedup or down, according to the force desired in the blow. In the same manner the blow can be suspended alto-gether, at any instant, without interfering with the rhyth-mical movement of the foot propel-ling the Engine, as when pickingup a pellet of gold, or when it isdesirable, for any reason, to use theinstrument temporarily as a hand-plugger. The force and effect of theblow may also be accurately regu-lated by the
. Catalogue of dental materials, furniture, instruments, etc., for sale . he hand-piece. By an almost automatic or instinctivemovement of the thumb of the operator, the collar is movedup or down, according to the force desired in the blow. In the same manner the blow can be suspended alto-gether, at any instant, without interfering with the rhyth-mical movement of the foot propel-ling the Engine, as when pickingup a pellet of gold, or when it isdesirable, for any reason, to use theinstrument temporarily as a hand-plugger. The force and effect of theblow may also be accurately regu-lated by the distance at which thepoint is held from the filling,—being heavier according to its prox-imity to the surface to be , where very delicate and care-ful manipulation is necessary, as atthe edges of a cavity in a frail tooth,the operator may determine the pre-cise force by the distance at whichthe point is held. The bit-holder has a smallspiral spring at its inner end, which,after each blow, draws it back in-stantly to receive the next blow ofthe lilllMli
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Keywords: ., bookcentury1800, bookdecade1870, bookidcatalogueofd, bookyear1876
