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DENTAL INSTRUMENT GAUGE 53

its cost is almost prohibitive for general use of dental stud-
ents. For measurement of angles in the technic work, in fact,
for taking any measurements desired, good results may be
accomplished on the illustration here given, if the instrument

is not at hand (Fig. 56).
1. To measure the width of the blade lay it in the small
slot numbered from o to 50, which will give the. width in
tenths of a millimeter.
2. To measure the length of the blade lay it lengthwise

in the gradations on the prin-
cipal bar and measure from
the cutting edge to the first
angle in the shank, which will

give the length in millimeters.
270
3. To measure the angle
of the blade with its shaft lay
the handle or shaft on the
main bar of the gauge and
parallel with the lengthwise

lines, having the blade turned
Fig. 57.—Measuring the angle of the
toward the small numbers to blade with its shaft. (American Text-
book of Operative Dentistry.)
the right; while holding it so,

bring the length of the blade parallel with one of the grada-
tions of the circle, which will give the angle in centigrades
(Fig. 57)-
4. To measure the angle of the cutting edge of the blade
with its shaft lay the instrument in the same position as

described in 3, and, without rotating it, move it to the left
(keeping its shait parallel with the lengthwise lines on the
m.ain bar of the gauge), until the angle of the blade is parallel
with one of the gradations to the left of the circular head.
This measurement is seldom necessary, as in most instruments

the cutting edge is at right angles to the length of the blade.