. Electric railway journal . rlapped. 8. Dip in insulating varnish. Drain, and bake over nightin oven. By this process the asbestos tape is thoroughly im-pregnated. This is an important feature, for as waspointed out some time ago in an A. I. E. E. paperby B. G. Lamme, chief engineer Westinghouse Electric& Manufacturing Company, the heat is transmittedlargely through the varnish, regardless of the kindof tape used. I have found that this method of insulating gives byfar the best results of any method yet tried where themotors must operate at a high temperature. The speci-fications which I have
. Electric railway journal . rlapped. 8. Dip in insulating varnish. Drain, and bake over nightin oven. By this process the asbestos tape is thoroughly im-pregnated. This is an important feature, for as waspointed out some time ago in an A. I. E. E. paperby B. G. Lamme, chief engineer Westinghouse Electric& Manufacturing Company, the heat is transmittedlargely through the varnish, regardless of the kindof tape used. I have found that this method of insulating gives byfar the best results of any method yet tried where themotors must operate at a high temperature. The speci-fications which I have given apply only to strap-woundfields, as we do not undertake to rewind any round-wirefields. We have, however, reinsulated some of our oldwire-wound fields by this method. Unfortunately, thepresent condition of the markets prevents us from fol-lowing the above specifications, but as soon as asbestosis again within reach we expect to have all fields insu-lated in this way. 834 ELECTRIC RAILWAY JOURNAL [Vol. XLIX, No. 18. Home-Made Air-Operated Punch BY G. B. SISSON Mechanical Department Georgia Railway & Power Company,Atlanta, Ga. Recently we had a line department job of punching18,000 holes in the braces of pole-top fittings. To dothis our master mechanic, J. E. Eaves, rigged up a pneumatic punch outof an old 8-in. brakecylinder. This punchis operated at 80 100 lb. pressureper square inch andwill punch holes upto 9/16 in. in diam-eter in rough stockxri in. thick. It willturn out the workten times as fast asit could be done bydrilling, and it alsosaves the cost of thedrills. The punchesare interchangeable. The pressure ex-erted on the lever isso powerful that thepunch goes rightthrough the stock,and in order to pre-vent its beingstopped with a shockthe spring shown un-der the air cylinderin the accompanyingillustration is pro-vided to catch this lever and act as a shock absorber. The controlling mechanism is made from a globe valvechanged to act like a whistle valve. Thi
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