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 1346
ectro Meters 1311 As it takes 1/100 amperes to swing the pointer over fullscale for every volt the instrument reads^ it must have 100olniis in the resistance coil. A 500 volt instrimient will have 500^000 ohms resistance,and hence 1/100 amperes will flow through the moving coil. The moving coil is… … 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…
