Abstracts of Technical Articles from Bell System Sources 



Radio Telephone System for Harbor and Coastal Services} C. N. 

 Anderson and H. M. Pruden. Radio telephone service with harbor 

 and coastal vessels is now being given through coastal stations In the 

 vicinities of seven large harbors on the Atlantic and Pacific coasts with 

 additional stations planned. The system is designed to be as simple 

 as possible from both the technical and operating standpoints on both 

 ship and shore. 



Recent developments in the shore-station design eliminates all 

 manipulations of the controls by the technical operator. This is made 

 possible principally because of crystal-controlled frequencies on shore 

 and ship, a "vogad" which keeps the transmitting volume of the shore 

 subscriber constant, and a "codan" incorporated in the shore radio 

 receiver which will operate on signal carrier but is highly discriminatory 

 against noise. A signaling system permits the traffic operator to call 

 in an individual boat by dialing the assigned code which rings a bell 

 on the particular boat called. The ship calls the shore station by 

 turning on the transmitter. The radio signal operates the codan in 

 the shore receiver which in turn lights a signal lamp in the traffic 

 switchboard. 



Gradually the system has been taking on more and more the aspects 

 of the wire telephone system. 



Ship Equipment for Harbor and Coastal Radio Telephone Service} 

 R. S. Bair. The ultimate objective in the design of radio telephone 

 apparatus for use on ships is to provide equipment which is as con- 

 venient and simple to operate as the telephone at home. To a con- 

 siderable degree this has been accomplished in the new 15- and 50-watt 

 ship sets that have recently been designed for use on harbor craft and 

 coastwise vessels. 



The requirements for sets of this type are discussed and the new 

 equipment is described in this paper. 



Protective Coatings for Metals } R. M. Burns and A. E. Schuh. 

 This book is one of the American Chemical Society Series of Scientific 

 and Technologic Monographs. The chapter headings are: Protective 



1 Proc. I. R. E., April 1939. 



2 Proc. I. R. E., April 1939. 



3 Published by Reinhold Publishing Corporation, New York, N. Y., 1939. 



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