. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . meters. 3. To measure the angleof the blade with its shaft laythe handle or shaft on themain bar of the gauge andparallel with the lengthwiselines, having the blade turnedtoward the small numbers tothe right; while holding it so,bring the length of the bladeparallel with one of the gra-dations of the circle, which will give the angle in centigrades(Fig. 58). 4. To measure the angle of the cutting edge of the bladewith its shaft lay the instrument in the same position asdescribed in 3, and
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . meters. 3. To measure the angleof the blade with its shaft laythe handle or shaft on themain bar of the gauge andparallel with the lengthwiselines, having the blade turnedtoward the small numbers tothe right; while holding it so,bring the length of the bladeparallel with one of the gra-dations of the circle, which will give the angle in centigrades(Fig. 58). 4. To measure the angle of the cutting edge of the bladewith its shaft lay the instrument in the same position asdescribed in 3, and, without rotating it, move it to the left(keeping its shaft parallel with the lengthwise lines on themain bar of the gauge), until the angle of the blade is parallelwith one of the gradations to the left of the circular measurement is seldom necessary, as in most instrumentsthe cutting edge is at right angles to the length of the , though, variations are found, as in BlacksGingival Trimmers and in some varieties of chisel. 5. To measure the amount of bevel of a blade place. Fig. 58.—Measuring the angle of theblade with its shaft. (American Text-book of Operative Dentistry.) THE BOLEY GAUGE the edge of the blade in the center of the circle, withone side of the blade on the zero division. The figure ^on the periphery of the circle on the line which fol-lows the other side of the blade will give the amountof bevel in centigrades. The first two measurementshere given are the only ones in the list of which theBoley gauge is capable. Formula Names.—Dr. G. V. Blacks set of instru-ments is designed largely after the first three methodsof measurement given above, and the measurementsare placed on the shafts of the instruments in theorder given, the first measurement representing thewidth of the blade in tenths of a millimeter, the sec-ond representing its length in millimeters, and thethird the angle of the blade with the shaft. In cases,however, where t
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