[Fig. 1490] represents small templates applied to a journal bearing, and it is seen that we may make the template as at t, gauging one corner only, or we may make it as at t′, thus gauging the length of the journal as well as the corners.
Fig. 1491.
[Fig. 1491] represents a female gauge applied to the corner of a bearing or brass for the above journal, it being obvious that the male and female templates when put together will fit as in [Fig. 1492].
Fig. 1492.
For measuring the diameters of metal wire and the thickness of rolled sheet metal, measuring instruments termed wire gauges and sheet metal measuring machines are employed. A simple wire gauge is usually formed of a piece of steel containing numerous notches, whose widths are equal to the intended thickness to be measured in each respective notch. These notches are marked with figures denoting the gauge-number which is represented by the notch.
For wire, however, a gauge having holes instead of notches is sometimes employed, the wire being measured by insertion in the hole, an operation manifestly impracticable in the case of sheet metal.