536 BELL SYSTEM TECHNICAL JOURNAL 



even by a moderate rain. Attenuations in excess of 25 decibels per mile 

 have been observed in rain of cloudburst proportions. 



The attenuation of waves somewhat longer than 3 centimeters is slight 

 for moderate and light rainfall. During a cloudburst, however, the attenu- 

 ation may approach a value of 5 decibels per mile. 



The Advancing Statistical Front}^ W. A. Shewhart. From the view- 

 point of general education, statistics is not simply a tool as is so often stated, 

 but a scientific way of looking at the universe; statistical method is not 

 something apart from scientific method but is scientific method in which 

 the three steps, hypothesis, experiment, and test of hypothesis, are adjusted 

 to allow for the fact that scientific inference is only probable. Applications 

 of statistics in this sense are rapidly extending to all fields of pure, back- 

 ground, and applied reserch. 



A New Crystal Channel Filter for Broad Band Carrier Systems}* E. S. 

 Willis. A new crystal channel filter for use in broad-band carrier tele- 

 phone systems is described. It requires less than two-thirds as much 

 mounting space as the earlier design and savings in materials and manufac- 

 turing effort are realized. The savings were made possible by assembling 

 the four crystal units in one lattice-type filter section rather than two, 

 resulting in a reduction in the number of component coils and capacitors. 



^^Jour. Anier. Statis. Assoc, March 1946. 

 ^*Elec. Engg., Trans. Sec, March 1946. 



