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 1377
arlier types^ and the spark gap^ andnon-inductive resistance are in a straight line, thus form-ing a direct path for the discharge, and reducing to a mini-mum the possibility of short circuit in the box in case ofexcessively heavy lightning discharges. One of the valuablefeatures of the MD-2… … Fig. 641direct current arrester, type m, form d-2 gap is surrounded by a strong electro-magnet, which im-mediately blows out the dynamic arc through the chute afterthe lightning discharge has passed. The gaps on arresters up to 850 volts are adjusted to ,.025 inch, and on higher voltages to .094…
