. Journal of electricity. Roof towers, outside line switches and air chambers The results of this examination were so gratify-ing that it was decided to build the third new unitpractically a duplicate of the first two units. The ex-cellent results obtained as regards efficiency and speedregulation encouraged the company to increase therated horsepower from 18,000 of the original contractto 23,000 horsepower without increasing any parts ex-cept those directly affected, that is the runner, shafts,guide vanes, etc. It is expected that 25,000 horsepower will be de-livered by this new turbine to th
. Journal of electricity. Roof towers, outside line switches and air chambers The results of this examination were so gratify-ing that it was decided to build the third new unitpractically a duplicate of the first two units. The ex-cellent results obtained as regards efficiency and speedregulation encouraged the company to increase therated horsepower from 18,000 of the original contractto 23,000 horsepower without increasing any parts ex-cept those directly affected, that is the runner, shafts,guide vanes, etc. It is expected that 25,000 horsepower will be de-livered by this new turbine to the generator shaft andthat both the efficiency and the speed regulation willbe as satisfactory as they are with the first units. S. L. Shuffleton, of Stone& Webster, was the engi-neer in charge of the in-stallation, and the Allis-Chalmers Company fur-nished the machinery. Front view assembly of new unit. JP^il^^^fe* 172 JOURNAL OF ELECTRICITY [Vol. 40—No. 4 PRESENT STATUS OF INSULATOR DEPRECIATION BY C. E. OAKES (The difficulties of early failure of insulators have presented a problem of nation-wide importance on high-voltage lines. Several of the Pacific Coast companies have already gotten together to try and devise ade-quate acceptance tests, and the federal authorities have carried on numerous experiments with that endin view. The results of these investigations, the advances made and the needs still remaining, are hereauthoritatively reviewed by a man who is special investigator for the Bureau of Standards at Washington,and who has been intimately connected with this work.—The Editor.) The rapidity with which deterioration and ulti-mate failure of insulators in every part of the country-is occurring has caused the problems to be investi-gated by various individuals or groups of individuals,in order to arrive at a satisfactory solution. Withinthe past two years a number of comp
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