1302 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1957 



/ 



DIELECTRIC COAT 0.005" THICK f' = 2.5 f"= 2.5x10"^ 



-50 



101 



_iz 



8^^-40 

 5 < OD 



z 



D< 



-20 



in 0.040 



20 25 30 35 40 



BENDING ANGLE IN DEGREES 



Fig. 2 — Normal mode bend. Dielectric-coated copper pipe with 2-iiich I.D. 

 and 2f-inch O.D. deflected to limit of elastic deformation (X = 5.4 mm). 



