IN ORDER TO DETERMINE WHETHER THE CROSSHEAD JOURNAL SURFACE IS ADEQUATELY SMOOTH, A LARGE, EDGES COIN MAY BE DRAWN LONGITUDINALLY ALONG THE JOURNAL. THE COIN IS PRESSED SLIGHTLY AT AN ANGLE OF APPROX 45° AGAINST THE JOURNAL SURFACE AND IS HELD TRANSVERSE TO THE DIRECTION OF MOVEMENT. WHEN COIN IS MOVED, NO VIBRATIONS MUST BE EITHER HEARD OR FELT.