392 



BELL SYSTEM JTECH NIC A L JOURNAL 



include an area Wzh, the maximum displacement is immediately .T2 and the 

 maximum acceleration is the quotient P/W2 , in accordance with equations 

 (1.2.15) and (1.2.16). 



As actually applied in the present instance, the British method was 

 modified slightly to make the procedure a routine numerical one. The 



3200 

 3000 

 2800 

 2600 

 2400 

 2200 



«2000 



o 



§ 1800 



o 



^1600 

 < 



o 



-11400 



1200 

 1000 

 800 

 600 

 400 

 200 



0.1 0.2 0.3 



0.4 0.5 0.6 0.7 0.8 0.9 

 DISPLACEMENT (INCHES) 



1.0 1.1 1.2 



Fig. 1.15.1 — Experimental load-displacement curve for Table II. 



computing form is given in detail in Table II, in which the data are taken 

 from an experimental load-displacement curve (Fig. 1.15.1) for the end spring 

 pads of a vacuum tube package. The load-displacement data are hsted in 

 Columns 3 and 4 of Table II. The meaning of each column in the table is as 

 follows. 



Column 1. n{= 1, 2, 3- • •) is the number that identifies the displacement 

 (and corresponding load) up to which the area under the load- 

 displacement curve is to be calculated. 



