292 BELL SYSTEM TECHNICAL JOURNAL 



sented wliich sliow that a strong (222) can be accounted for by the dynamical 

 theory. 



An impedance network model is briefly discussed which may aid in quah- 

 tative considerations of the dynamical theory for the case of several 

 diffracted waves. 



Determiiialioii of g- Values in Paramagnetic Organic Compounds by Micro- 

 wave Resonance. A. N. Holden/ C. Kittel/ F. R. Merritt^ and W. A. 

 Yager.i Letter to the Editor, Phys. Rev., V. 77, pp. 146-147, Jan. 1, 1950. 



Nonlinear Coil Generators of Short Pulses.^ L. W. Hussey.^ I.R.E., Proc, 

 V. 38, pp. 40-44, Jan., 1950. 



Abstract — Small permalloy coils and circuits have been developed which 

 produce pulses well below a tenth of a microsecond in duration with repeti- 

 tion rates up to a few megacycles. 



The construction of these coils is described. Low power circuits are di- 

 cussed suitable for different types of drive and different frequency ranges. 



Subjective Effects in Binaural Hearing. W. Koenig.' Letter to the Editor, 

 Acoustical Soc. Am., Jl., V. 22, pp. 61-62, Jan., 1950. 



Abstract — Experiments with a binaural telephone system disclosed some 

 remarkable properties, notably its ability to "squelch" reverberation and 

 background noises, as compared to a system having only one pickup. No 

 explanation has been found for this subjective effect. It was also discovered 

 that a well-known defect in the directional discrimination of binaural sys- 

 tems was remedied by a mechanical arrangement which rotated the pickup 

 microphones as the listener turned his head. 



Corrosion Testing of Buried Cables. T. J. Maitland.^ Corrosion, V. 6, pp. 

 1-8, Jan., 1950. 



40AC1 Carrier Telegraph System. A. L. Matte.' Tel. & Tel. Age, No. 2, 

 pp. 7-9, Feb., 1950. 



Giving New Life to Old Equipment. P. H. Miele."' Bell Tel. Mag., V. 28, 

 pp. 154-163, Autumn, 1949. 



Thermionic Emission of Thin Films of Alkaline Earth Oxide Deposited by 

 Evaporation.\ G. E. Moore' and H. W. Ai>lison'.' Phys. Rev., V. 77, pp. 

 246-257, Jan. 15, 1950. 



Abstract — Monomolecular lilms of BaO or SrO were deposited by evap- 

 oration on clean tungsten or molybdenum surfaces with precautions to elimi- 

 nate effects caused by excess metal of the oxide or by heating. Thermionic 

 emissions of the same order of magnitude as from commercial oxide cathodes 

 have been ol)taine(l from these systems. The results can be explained quali- 

 tatively ])y considering the adsorl^ed molecules as oriented di])oles. Although 



t A re])riiil of lliis article nia\- he olilaiiiL-d on rc'(|iH'sl lo tin.' (.'dilor ol llu' 15..S.'1'.J. 



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