SLOW UKLKAsi': Kl:l,.\^ i)i:si(;\ 



I!)." 



2.8 



1 1.5 2 3 4 5 6 8 10 15 20 30 40 50 



Z 



Fig. 5 — Factors for computing release time. 



different values of G. For each sleeve size two curves are shown, cor- 

 responding to the limits of variation in magnetic characteristics, or in 

 (Ri and (p" — ^o • The dotted curve included for comparison is the rela- 

 tion of Fig. 6. 



An important property of the t versus CF relation can be demonstrated 

 by substituting in (6) the expression for (Ri given by (8). There is thus 

 obtained the equation: 



t = 



4:TrG{<p — <po) ( In z 



^ 



1 



(9) 



A plot of the function of z appearing in brackets in this equation is 

 included in Fig. 5. In the vicinity of the maximum at z ^ 3.0!), this func- 

 tion is nearly a constant, varying little for values of z between 2 and 6. 

 In this range t varies inversely with 3^, and the proportionality constant 

 depends only upon G, the sleeve conductance, and the term (/?" — (po , 

 which is relatively independent of material and dimensional variations, 

 as shown later. This confirms the conclusion, previously indicated by 

 graphical analysis, that through a considerable range of operation the 



