378 



BELL SYSTEM TECHNICAL JOURNAL 



vibration of any element in the packaged item, which should be 

 determined by test beforehand (see, also, Section 4.2). In any case 

 it is advisable to provide damping for the suspension. 



3.4 

 3.2 

 3.0 

 2.8 

 2.6 

 2.4 

 22 

 2.0 

 1.8 

 1,6 

 1.4 

 1.2 

 1.0 

 08 

 06 

 04 

 0.2 



0.1 2 0.3 0.4 5 6 0.7 0.8 9 10 



Fig. 1.8.3 — Tension spring package design curve. Equation (1.7.10). 



13. Enter Fig. 1.8.3 with Xq/ ( and find k/K. If a four-spring package is 

 desired, instead of an eight-spring package, (see Section 1.7) the 

 value of k/K found on Fig. 1.8.3 should be multiplied by two before 

 entering it on Line 13 in Table I. This is the only change required 

 in the procedure. 



14. Calculate k = A'f ^, j. This is the spring rate of each of the springs in 

 pounds per inch. 



