Vor. 8, No. 4
INDEX TO BOOK REVIEWS I N 1930
ULICH,H., C272. ULLMANN, F., D220, D221. ULREY.C. T., D632. UNDERWOOD, A. J. V.. D245. UNITED STATES STEEL CORPORATION, A37. UNrvEnsrrv OF ARKANSAS, K32. UNIVERSITY OF ILLINOIS, 113. UNIYERSI~ O F K ENTUCKY, K50. UREY,H. C., C32. U. S. DEPARTMENT OF THE INTERIOR. WA~GTON D., C., 13, 15. 115, 123. 124,125,126,127, BO, I32,136,138,139. 140,141,143, K40. VAIL,J. G., D538. VALK~), E., CQQ. VANADIUM CORPORATION OF AMERICA, C278. VAN BUSKIEK. E. F.,K45. VAN KLoowER, H. S., C64. VAN'THOZF,J. H., C113. VERErN DEUTSCHERCBEMIKER,D343, D616. VILLAYECCHIA, G. V.. K10. VINAL, G. W., D556. VOGEL, H.. D635. VOLLHARDT, E., D189. VRIES,LOUISDE , K26.
WIIESSER. B., D293. WAGNER. A,, DS03. WAGNER, C., '2272. WALKER, J. H., D463. WALLACE, B. B.. D336. WARE, J. C., C61. WATSON, K. M., D595. W m a , H. A,, 118. WEBEL.A., K25. WEERTS,J., D182. WEISER,H. B., C67. C68. Wmcn, I. M.. K15. WELTON, L. E., 122. WELTZIEN. W.. D113. WENDLFIR, A,. D377. WERKMAN, C. H., B23. WEST, C. J., C18, H7. K28 WH~TCOMB. E. S., 143. WIGGIKTON, R . , D125. WILLIAMS, J. W., C107. WILSON, J. A,, D11S. WINTON,A. L., GS. Wnrcm, P. G., D571. Wiisr, J.. C223. WYCKOFF,R. W. G., B13. WYNN,E. E., D408. ZANDER, W., D187. ZAPOLEON. L. B., D330. ZIMMERMAN, B. L., 137.
Brazing Replacing Soldering in Electrical Industry. Blow torch and soldering iron. essential tools of the electrical worker for years, are becoming obsolete. Brazing is taking the place of soldering: silver is being substituted for lead. Thus is summarized the change which is now coming over a fundamental practice of the electrical industry, that of connecting together two wires or two electrical conductors. The process of brazing war described recently before the American I n ~ t i t u t eof Electrical Engineers by S m u e l Martin. Jr., of the General Electric Co. In spite of the fact that brazing makes use of the coin metal, silver, instead of cheap lead used in soldering, Mr. Martin said that the ncwer process is actually cheaper than soldering. The equipment needed is a stcp-down transformer, a foot switch and tongs in which t o hold the pieces to be brazed Two carbon blocks on the ends of each branch of the tongs make the connection with the pieces to be brazed. "The carbon electrodes heat up quickly," Mr. Martin explained. "and the heat passes from them into the parts heing joined, raising their temperature to the melting point of the brazing alloy. The alloy, in the form of a thin strip for convenience, is then applied to the contact surfaces of the parts being brazed. It melts and flows through the joints uniting the parts in a solid mass." A brazed joint is preferred t o a soldered connection, i t was explained, because it is stronger and cheaper, has greater conductivity and higher heat-resisting qualities, and takes less time to make.-Science Service
