. Electric railway journal . Evenwith the side dump cars it is still necessary to leveloff the dumped material by hand. The flat cars shownin the pictures are only 3i ft. to 4 ft. above the rail. The cost of work at the dump has been reduced bythe new apparatus to about one-third of the formercost by hand labor. The crane is still available forshovel work if desired, as the unloader boom can bereplaced by the shovel boom in a short time. Device for Use in Measuring DielectricStrength of Oils IN MEASURING the dielectric strength of oil it isnecessary to immerse a spark gap in the oil. To dothis
. Electric railway journal . Evenwith the side dump cars it is still necessary to leveloff the dumped material by hand. The flat cars shownin the pictures are only 3i ft. to 4 ft. above the rail. The cost of work at the dump has been reduced bythe new apparatus to about one-third of the formercost by hand labor. The crane is still available forshovel work if desired, as the unloader boom can bereplaced by the shovel boom in a short time. Device for Use in Measuring DielectricStrength of Oils IN MEASURING the dielectric strength of oil it isnecessary to immerse a spark gap in the oil. To dothis ordinarily requires a large sample of oil and ahigh voltage for use across the gap. The WestinghouseElectric & Manufacturing Company has just developeda device for the purpose of securing reliable indicationswith a minimum sample of oil and a relatively low test-ing voltage. It consists of a molded cup in one piece,with brass electrode bushing threaded to receive pack-ing glands. Electrodes are made from brass cylinders. PARTS OF OIL TESTING CUP AND COMPLETE CUP FORUSE IN MEASURING DIELECTRIC STRENGTH OF OIL 1 in. in diameter, threaded at one end to receive a locknut, with a binding post on the outside end for connec-tion to the transformer leads. A steel feeler gage forsetting the gap at exactly in. is provided and isattached to one of the binding posts when not in use. The testing cup weighs 6i leb. net and requires a4-oz. sample of oil. A voltage of 25,000 is sufficient forreliable testing, and seldom more than 30,000 voltswould be required to discharge across the standard gap( in.) through any insulating oil. The subways in New York are not the only railwayswhich have trouble in handling the crowds at the rushhour. In reply to complaints of congestion on the Lon-don Underground Railways and the London GeneralOmnibus Company, H. E. Blain, operating manager,stated that the Underground Railways are carrying 30per cent more passengers than in the pre-war insure
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