Abstracts of Technical Articles from Bell System Sources 



Some Methods for Making Resonant Circuit Response and Impedance 

 Calculations} H. T. Budenbom. This article presents a series of 

 short-cut methods for the computation of the amplitude and phase- 

 response characteristics of one- and two-mesh circuits; the extension 

 of the method to three- and four-mesh networks is carried out formally. 

 It also treats the impedance-frequency characteristics of singly reso- 

 nant circuits. The plan of attack in the single-circuit impedance and 

 multi-mesh response cases is to express the desired circuit or transfer 

 impedance as a polar numeric multiplied by a sizing constant which 

 turns out to be a simple reactance element of the circuit. 



A Rapid Method for the Determination of Sulfur in Ferromagnetic 

 Alloys."^ B. L. Clarke, L. A. Wooten, and C. H. Pottenger. A 

 method is described for the determination of sulfur in ferrous alloys 

 of high-nickel content, wherein the sample is heated in hydrogen at 

 1100° to 1200° C, and the liberated hydrogen sulfide absorbed in 

 ammoniacal cadmium nitrate solution. The method is generally 

 applicable to iron-nickel-cobalt alloys. 



The precision of the method for the range of 0.005 to 0.020 per cent 

 sulfur is shown to be ± 0.001 per cent sulfur on the basis of a 10-gram 

 sample. 



The Newly Discovered Elementary Particles} Karl K. Darrow. 

 During the three years following the discovery of heavy hydrogen in 

 the latter part of 1931, four additional elementary particles of matter 

 lighter than the alpha particle (nucleus of the ordinary helium atom) 

 have been discovered where only two were known previously. This is 

 considered extraordinary even for the present rapid pace of physics 

 which sometimes requires physicists to revise their fundamental 

 concepts of matter almost overnight. These five newly discovered 

 particles formed the subject matter of a highly interesting and instruc- 

 tive address delivered recently by Doctor Darrow at a meeting of the 

 American Institute of Electrical Engineers' New York Section; the 

 essential substance of this illuminating address is presented in the 

 published article. 



* Radio Engg., August, 1935. 



2 Indus. & Engg. Chem., Analytical Edition, July 15, 1935. 



3 Elec. Engg., August, 1935. 



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