F. H. Richardson's bluebook of projection (1935)

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CURRENT RECTIFICATION 275 166. What causes a ring of fire to appear in the amature? Where do you look for an open circuit ? 167. What will cause the armature to become overheated? What may happen ? ^ Hot Bearings, pace 324 168. If a bearing runs hot what should be done? 169. Should water be used to cool down a hot bearing? 170. How may a hot bearing be cooled down? 171. What 'must you avoid when bronze bearing runs hot? Permissible Temperatures, page 325 172. If any part of a motor or generator feels warm, does this indicate something wrong? 173. What is the allowable temperature of machine parts? • 174. How can the temperature of a machine part be measured? • h