. Scientific American Volume 92 Number 11 (March 1905). d when discussing practi-cal problems the author describes the methodof replacing an air-core transformer by itsequivalent network. Some of the problems intwo-pha«e theory are discussed and how thetheorems of solid geometry can be usefullyapplied to them is shown. The main problemsin the theory of phase indicator and inductiontype watt-hour meters are stated and approxi-mate solutions are given. The theory of rotat-ing magnetic fields is also described as wellas the interesting problem of the nature ofthe magnetic field around parallel wi
. Scientific American Volume 92 Number 11 (March 1905). d when discussing practi-cal problems the author describes the methodof replacing an air-core transformer by itsequivalent network. Some of the problems intwo-pha«e theory are discussed and how thetheorems of solid geometry can be usefullyapplied to them is shown. The main problemsin the theory of phase indicator and inductiontype watt-hour meters are stated and approxi-mate solutions are given. The theory of rotat-ing magnetic fields is also described as wellas the interesting problem of the nature ofthe magnetic field around parallel wires carry-ing polyphase currents. Most helpful to thepractical worker will be found the approximatesolutions of the problem of the eddy currentsin magnetic metals. The book is very com-plete and will be found useful to both the stu-dent and the practical man. INDEX OF INVENTIONS For which Letters Patent of the United States were Issued for the Week Ending March 7, 1905AND BACH BEARING THAT DATE [See note at end of list about copies of these patents.]. Acetylene .venerator, A. Yancey 784,462 Acetylene generator feeding device, A. Yancey 784,463 Advertising button, changeable, Smith & Weinland 784,077 Agar-agar and product of same, manufactur-ing limpid solutions of, W. Riebensahm. 784,349 Air brake apparatus, C. E. Turner 784,526 Air brake mechanism, II. B. Haddock 784,321 Air brake system, I. M. Simons 784,506 Air regulating and indicating device, com-pressed, C. H. Richwood 784,228 Air separator and water seal fitting, S. V. Sharood 784,185 Air ship, H. E. Honeywell 784,161 THE \ rRUDENTIAL HAS THE STRENGTH OF <?GIBRALTAR You May be Surprised to know how much Life Insurance you canget for an average weekly saving of twodollars, payable to The Prudential Quarterly, Semi-Annually or Annually. Send us your age and we will send you the figures. The Prudential InsuranceCompany of Aherica. JOHN F. DRYDEN, President Home Office:NEWARK, N. J. DEPT. 121 WM Important Announcement RE
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthotwater, bookyear190
