HE BELL SYSTEM 



meal lournal 



OTED TO THE SCIENTIFIC ^^^ AND ENGINEERING 

 »ECTS OF ELECTRICAL COMMUNICATION 



UME XXXV SEPTEMBER 1956 NUMBER 5 



Electronics in Telephone Switching Systems a. e. joel 991 



Combined Measurements of Field Effect, Surface Photo-Voltage 

 and Photo-Conductivity w. h. brattain and c. g. b. garrett 1019 



Distribution and Cross-Sections of Fast States on Germaniimi 

 Surfaces c. g. b. garrett and w. h. brattain 1041 



Transistorized Binary Pulse Regenerator l. r, wrathall 1059 



Transistor Pulse Regenerative Amplifiers f. h. tendick, jr. 1085 



Observed 5-6 mm Attenuation for the Circular Electric Wave in 

 Small and Medium-Sized Pipes a. p. king 1115 



Automatic Testing in Telephone Manufacture d. t. robb 1129 



Automatic Manufacturing Testing of Relay Switching Circuits 



L. D. HANSEN 1155 



Automatic Machine for Testing Capacitors and Resistance-Capaci- 

 tance Networks c. c. cole and h. r. shillington 1179 



A 60-Foot Diameter Parabolic Antenna for Propagation Studies 



A, B. CRAWFORD, H. T. FRIIS AND W. C. JAKES, JR. 1199 



The Use of an Interference Microscope for Measurement of Ex- 

 tremely Thin Surface Layers w. l. bond and f. m. smits 1209 



Bell System Technical Papers Not Published in This Journal 1223 



Recent Bell System Monographs 1230 



Contributors to This Issue 1233 



COPYRIGHT 1956 AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



