Abstracts of Bell System Technical Papers* 

 Not Published in This Journal 



A Full Automatic Private-Line Teletypewriter Switeliitu/ System. W. M. 

 Bacon' and G. A. Locke'. Trans. A.I.E.E., 70, Part 1, pp. 473-480, 

 1951. (Monograph 1837). 



This paper describes a full automatic teletj-pewriter message switching s3-stem 

 for use in private-line networks involving one or more switc^hing centers and a 

 multipHcity of local or long-distance lines, each of which may lia\-e one or more 

 stations. This system provides fast telet^'pewriter communication from any 

 station to any other station or gi-oup of stations in the network. At its point of 

 origin a message first is perforated in tape accompanied l)y suitable directing 

 and end-of-message characters, thereafter it is transmitted automatically, stored 

 temporaril}' in perforated tape at a switching office, and then i-outed at high 

 speed to its point or points of destination. Important features are the arrange- 

 ments pro\dded to permit efficient use of long full duplex transmission lines, the 

 full automatic handling of multiple-address messages with only a single originat- 

 ing transmission, and the various guards and alarms which are provided to 

 protect against loss of messages in case of trouble. 



Operational Study of a Highway Mobile Telephone System. L. A. 

 Dorff\ Trans. A.I.E.E., 70, Part 1, pp. 31-37, 1951. (Monograph 



1838). 



The Dynamics of the Middle Ear and Its Relation to the Acuity of Hear- 

 ing. H. Fletcher\ ./. Acoust. Soc. Am., 24, pp. 129-131, March, 1952. 



The transformer action of the middle ear as measured by Bek6sy is shown to 

 be the principal cause for the low acuity of hearing for low fre(}uencies. Because 

 of the \'ery low mechanical imi)edance across the basilar membrane at low fre- 

 quencies, large acoustical pressures in fi-ont of the ear drum produce appieciable 

 acoustical pressures across the basilar memi)rane. For example, at 100 ci)s this 

 pressure is thirty times and at 6000 cps it is one-tenth that created acn-oss the 

 basilar membrane. 



Diffusion of Donor and Acceptor Eleynents Into Germanium. C. S. 

 Fuller . Phys. Rev., 86, pp. 130-137, April 1, 1952. 



* Certain of these papers are available as Bell System Monographs and may be 

 obtained on request to the Publication Def^artment, Bell Telephone Lal)oratories, 

 Inc., 463 West Street, New York 14, X. Y . For pa])ers available in this form, the 

 monograph number is given in parentheses following the date of puijlication, and 

 this number should be given in all requests. 



' Bell Telephone Laboratories 



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