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 1347
Fig. 614switch board instrument a certain spot and stop dead. This is called a ^^dead beat^needle. Some instruments have electro-magnets instead of per-manent magnets. Tlie Thomson Astatic instruments areof this type. Two of these instruments are shown in Figs.615 and 616. This latter has a scale… … Fig. 615switch board ammeter
