. Electrical world. strip thoroughly insulatedwith horn fibre linen tape, dipped in the best quality of insulating 494 ELECTRICAL WORLD and ENGINEER. Vol. XLII, No. lo. varnish and thoroughly baked. Surface bands are used to retainthe coils in the slots. The commutator segments are well proportioned, being of suf-ficient length and depth to allow ample margin for wear. Theflanges are of cast iron, insulated from the segments with solid Vrings. The mica segments are of the best grade of pure, soft micaand the mechanical construction of the commutator is very composition carb
. Electrical world. strip thoroughly insulatedwith horn fibre linen tape, dipped in the best quality of insulating 494 ELECTRICAL WORLD and ENGINEER. Vol. XLII, No. lo. varnish and thoroughly baked. Surface bands are used to retainthe coils in the slots. The commutator segments are well proportioned, being of suf-ficient length and depth to allow ample margin for wear. Theflanges are of cast iron, insulated from the segments with solid Vrings. The mica segments are of the best grade of pure, soft micaand the mechanical construction of the commutator is very composition carbon-graphite brushes are also used,clamped directly on the face of the holders. The holders are ofheavo brass construction amply large to carrj all current requiredwithout heating. The holders are of such a type that the brushesoperate without vibration and the machines run cool and brush holder stems to which the holders are fastened areinsulated from the quadrant and firmly secured in place to prevent. have made the Warner enclosed arc lamp a success on circuitsof such high amperage. In the first place he uses a globe whichis considerably larger than the ones used on ordinary enclosed arclamps, and instead of using an iron gas cap, he has made the gascap entirely of an insulating material in one piece, which is aninsulator to both heat and electricity. This cap with its globe isat a reasonable distance from the bottom of the lamp body, p«r-mitting the air to circulate around and about the globe, and the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
