. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . method of adaptation to thetaking of the measurement of the various parts of metric or French decimal system is the one nowadopted by most scientific men and the student shouldbegin at once to put its principles into use. It is based onthe French meter, which equals inches in theold measurement. The denominations of the systemmay be learned here, but the only method of thoroughlyappreciating them is to put them into actual denominations, so far as thei
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . method of adaptation to thetaking of the measurement of the various parts of metric or French decimal system is the one nowadopted by most scientific men and the student shouldbegin at once to put its principles into use. It is based onthe French meter, which equals inches in theold measurement. The denominations of the systemmay be learned here, but the only method of thoroughlyappreciating them is to put them into actual denominations, so far as their uses in dentistry require,are as follows: One Meter 39 inches (approximate) One Decimeter (one-tenth of a meter) 4 inches (approximate) One Centimeter (one-hundredth meter) 2/5 inch (approximate) One Millimeter (one-thousandth meter) 1/25 inch (approximate). Tenths, hundredths and thousandths of a millimeter. One thousandth of a millimeter is known as a micron and is used only in microscopicwork. (Table from Blacks Operative Dentistry.) The Centigrade Circle.—This is a circle divided into one 270. 180 Fig. 56. -The centigrade circle. 25, 50 and 75 centigrades equal respectively90, 180 and 270 astronomical degrees. hundred parts or degrees, instead of 360°, as is the astronom-ical circle. To convert centigrades, the degrees represented CENTIGRADE ANCLES ST m this circle, into astronomical degrees, 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
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