Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1346
Electro Meters 1311 As it takes 1/100 amperes to swing the pointer over fullscale for every volt the instrument reads, it must have 100ohms in the resistance coil. A 500 volt instrument will have 500,000 ohms resistance,and hence 1/100 amperes wTill flow through the moving coil. The moving coil is… … Fig. 614switch board instrument a certain spot and stop dead. This is called a dead beatneedle. Some instruments have electro-magnets instead of per-manent magnets. The Thomson Astatic instruments areof this type. Two of these instruments are shown in Figs.615 and 616. This latter has a scale or…
