Bausch & Lomb General Purpose Optical Measuring Scale
Scale A measures radii from 1/6" to 3/8" in 1/32 "
Scale B measures angles in degree intervals over a
90 degree range
Scale C measures decimal fractions of an inch over
a 0.500" range at 0.005" intervals
Scale D is a metric scale, 10 mm long, engraved in
Scale E contains three lines: 0.001", 0.002" and
Bausch & Lomb Inch Optical Measuring Scale
Measures 0.005" intervals over a 0.750" range
Bausch & Lomb Metric Optical Measuring Scale
Measures 0.1mm increments over a 20mm range
Bausch & Lomb Protractor Scale
Measures angles at one degree intervals over a 360 degree range.
Five degree intervals are indicated by a long line and 15 degree
intervals are indicated by lines extending almost to the center of the
scale. Every tenth degree is numbered.
The Measuring Magnifier by Bausch & Lomb is the most useful when size matters.