Lesson 2/Learning Event 1
Slide calipers, Figure 21, have one fixed jaw and one sliding jaw. When the
two jaws are brought in contact with surfaces to be measured, the distance
between the surfaces may be read from the scale. The ends of the jaws are
shaped so that it is possible to measure both inside and outside surfaces.
Slide calipers are normally made in 3-inch sizes, although larger sizes are
available. The standard 3-inch slide caliper measures from 0 to 20 inches
outside, and from 1/8 inch to a little more than 2 inches inside.
caliper shown has a mark or graduation line on the fixed jaw. This enables
the user to read the inside measurement, while the outside measurement can
be read directly from the inner edge of the fixed jaw. If these marks were
not on the slide caliper, it would be necessary to add the thickness of the
nibs to the reading when using it as an inside caliper. All slide calipers
are equipped with a locking device which makes it possible to hold the jaws
in any desired position. There is an ordinary rule on the other side.