Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1346
ought up to proper speed by swinging the mag-nets in a little. For heavy currents the appearance of the meter is quitedifferent, as is shown in Fig. 621. The retarding device is Electro Meters 1317 enclosed in a case, and the whole instrument is enclosedin a dust-proof glass case. Switchboard… … Fig. 621large capacity thomson recording watt-hour meter in some quarters that if a switchboard is blown out everyday with compressed air, and the instruments wiped with adust cloth, nothing further in the way of inspection needbe done until something goes wrong. There are more moving parts on a…
