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 1348
616 ILLUMINATED DIAL INSTRUMENT _ The instrument shown in Fig. 614 has an extra handending in a ring. This can be set at the voltage it isdesired to maintain. The most hasty glance will then showwhether the voltage is too high or too low. Electro Meters 1313 In order to save space on switchboards… … Fig. 617thomson horizontal ammeter Fig. 618 are portable instruments used for alternating cur-rent only. In an emergency they can be used to measuredirect current by reading, then reversing current, readingagain, and averaging results. The action of the magnetism of the inclined coil is totwist the…
