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 1344
N^. rV 1 1 r 1 1 1 1\ ■^,i i J- .*.://-•— 1—1 1 t==^ o o … Fig. 612magnet and shunt of weston ammeter vary in strength^ the instrument would not read correctly^but the magnets are so treated that the falling off in strengthover a number of years is inappreciable. The strip or shunt for portable instruments is alwaysinside the case, while for switchboard…
