The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . Fig. 99. countersink. Fig. 99 illustrates Happersbergers patent, flat-bottomedcountersinks, which are designed for making or deepening flat bottomedcountersinks for screw heads of any kind. The screw-thread or holewill not be injured in using these tools. Fig. 100 illustrates a set of wheel countersinks made with cutterson one end and burnishers on theother. Countersinks are also madefrom steel in the Ibrm of drills andfrom emery in the form of a conewith metal handle for e
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . Fig. 99. countersink. Fig. 99 illustrates Happersbergers patent, flat-bottomedcountersinks, which are designed for making or deepening flat bottomedcountersinks for screw heads of any kind. The screw-thread or holewill not be injured in using these tools. Fig. 100 illustrates a set of wheel countersinks made with cutterson one end and burnishers on theother. Countersinks are also madefrom steel in the Ibrm of drills andfrom emery in the form of a conewith metal handle for emerv countersink will be foundvery useful for large holes and for trimming the edges of holes inenamel Fig. 100. CRANK. The bent portion of an axis serving as a handle or connec-tion for communicating circular motion, as the crank on a steam twist or distort, as applied to metals. CREMAILLERE. The winding rack of a repeating watch. CRESCENT. The concave formed in the roller of the lever escape-ment to allow the passage of the safety pin. Crocus. 114 CROCUS. Sesquioxide of iron used with oil for polishing brassand steel work. Crystals of sulphate of iron are subjected to a great heat,and then graded into polishing powders of various degrees of more calcined part is of a bluish purple color, coarser and harderthan the less calcined and is known as crocus The less calcined andfiner portion is of a scarlet color and is known as rouge. CROWN-WHEEL. A wheel whose teeth are set at right angles toits plane. A contrate wheel. The escape wheel of the verge escape-ment is a crown wheel. CRUCIBLE. A melting pot capable of enduring great heat, with-out injury and used for mel
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
