. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . ees, multij)ly ,^6o ])y ilicnumber of centigradcs anddivide by loo; or fa sim])]er method)after multiplying, cut off two fig-ures (move the decimal point twofigures to the left) as in calculatinginterest (Fig. 56). COMPARISON OF CENTIGRADE AN-GLES WITH ASTRONOMICAL DE-GREES (TABLE FROM BLACK) 6 ccntigrades degrees 12 ccntigrades 43. 2 degrees 18 centigrades degrees 23 centigrades degrees 28 centigrades degrees 80 centigrades degrees 95 centigrades degree
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . ees, multij)ly ,^6o ])y ilicnumber of centigradcs anddivide by loo; or fa sim])]er method)after multiplying, cut off two fig-ures (move the decimal point twofigures to the left) as in calculatinginterest (Fig. 56). COMPARISON OF CENTIGRADE AN-GLES WITH ASTRONOMICAL DE-GREES (TABLE FROM BLACK) 6 ccntigrades degrees 12 ccntigrades 43. 2 degrees 18 centigrades degrees 23 centigrades degrees 28 centigrades degrees 80 centigrades degrees 95 centigrades degrees The Dental Instrument Gauge The millimeter measure andthe centigrade circle have beencombined in an instrument knownas the Dental Instrument appliance is largely used byinstrument manufacturers formeasuring the length, width andangle of the cutting edge of theblade and the angles in the shankof the instrument; but its cost isalmost prohibitive for general useof dental students. For measure-ment of angles in the technic work,m fact, for taking any measure-ments desired, good results may be. 57-—Dental instrumentgauge. 52 INSTRUMENTS AND APPLIANCES 270 -90 accomplished on the illustration here given if the instrumentis not at hand (Fig. 57). 1. To measure the width of the blade lay it in the smallslot numbered from o to 50, which will give the width intenths of a millimeter. 2. To measure the length of the blade lay it lengthwisein the gradations on the principal bar and measure from the cutting edge to the first anglein the shank, which will givethe length in millimeters. 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
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