. Annual report 1919. b-jects now under investigation are referred to more fully below. Additions to the equipment have been made as they became necessary andplans are now under consideration for additions to the building to provide adequateaccommodation for those sections which are now handicapped for lack of space. 19 H. (i) 274 TWELFTH ANNUAL REPORT OF THE No. 49 High-Tension and Electrical Testing Laboratory Previous reports have outlined the general activities of this Laboratory andhave listed various items of equipment which are essential to its work, hence it isnot necessary to enumerat
. Annual report 1919. b-jects now under investigation are referred to more fully below. Additions to the equipment have been made as they became necessary andplans are now under consideration for additions to the building to provide adequateaccommodation for those sections which are now handicapped for lack of space. 19 H. (i) 274 TWELFTH ANNUAL REPORT OF THE No. 49 High-Tension and Electrical Testing Laboratory Previous reports have outlined the general activities of this Laboratory andhave listed various items of equipment which are essential to its work, hence it isnot necessary to enumerate the various items in detail nor to recount the routinetests which have become standard practice. In a general way we may say that this Laboratory is prepared to undertakepractical electrical tests, studies or investigations of almost any range. Tests whichhave become standard practice are systematized and treated as routine for economyof operation as well as proper comparison of results. Frequently, however, special. Fifty Thousand volt test bench, arranged for automatic operation. Used for testing RubberGloves, Transformer Oil and other Insulating Materials. Oil Test Cup shown in place. —Electrical Laboratory. tests are required to clear up some doubtful phenomena and the final results areusually of sufficient importance to be dignified by the name of an investigation. Routine electrical tests are made on many classes of apparatus and various commercial tests are made on constant potential and constant currenttransformers, alternating and direct-current generators and motors along the linesmentioned in previous reports with the added advantage of equipment especiallysuited for this class of work. The testing of oil for dielectric strength is a routinetest important not only because all the high-tension transformers and oil-breakersare thus looked after, but approximately fifty samples per month are received fromvarious municipal stations. High-tension insulat
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