Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1187
anifest itself by a more or lesssevere jarring^ and shaking of the frame upon which itrests when running. Whether an armature is in balance while at rest can beeasily determined by placing it upon two knife edges, asshown in Fig. 505. If these edges are perfectly level,the armature will roll to one… … Fig. 506 its length a small excess of weight on one side will cause itto roll over. If a very good balance for high speed is to beobtained this method must not be relied upon. In such acase the armature should be placed in bearings and run atits proper speed. If there is much jarring or shaking…
