KS'l'IMAI'ION AND ( ( »\'l'l'.( )1, ()!•' OI'KK A'l'K 'I'lMI') OK l{i;i,ANS \ \',\ 



As mininuziii<>; rcljound is of major iinpoi'Innce in relay (l('si}i;ii, tlic 

 relations eoiilrolliii^ (he kinetic enei'<2;y to which it is |)i'o])orti()nal are of 

 (lesi.iin interest. Most, of the (|iiantilies a|)|)eariii<; in the al)o\'e relations, 

 such as the spring load and the traxcl, ai'e iixed hy operatiiifi; re(|uire- 

 inents oi- other desi<i;n considerations, 'i'here is, however, considerable 

 treedoni in the desit^n relations (i\in<;' the elTectixc mass of the armalui'e, 

 pai't icularly in .select inj^ its axis of rotation. '\l\v pi'eceding relations 

 show thai the maji;n(>tic draji; I'atio can he inci'eased, and rebound I'e- 

 duced, by the decrease in I \, result inii fi'om a decrease in e('fec(i\(' mass. 

 While such a decrea.se increas(\s the lalio / / ,/ , it results in a net decrease 

 in the \'alue of /, the motion time. .\ low effective armature mass is 

 therefore adxantaiicous both lor fast, I'clease and for a hi};h dra)^' I'atio 

 for the reduction of rebound. 



REFERENCES 



1. 1{. I;. I'cck, Jr., ;ui(l II. N. Waj^ar, Manuel ic nosij:;!! of Relays, pa^o 2'.] of this 



i.ssuc. 



2. H. L. IVck, Jr., Analysis ol' Measured .M.i^nct i/,;it ion ;in(l Pull ("liarac(('ri.stics, 



pajrc 7S of (his issue. 

 :^ H. Wwcdcnsky, .\iiii. d. IMiys., 64. p. (lO'.l, IDL'i. 

 1. .M. .\. boy;aii, Dviiainic Mcasuicinciils of IMccI roiuat;ii('l ic Devices, P. S. T. J., 



p. 1113, Nov.,' V.)-)A. 

 "). H. L. Peek, Jr., Priiicij)les of Slow Roloaso Helay Desifiii, i)afi;o 1S7 of this i.ssuc. 

 (i. .\. .\. Currie, The (ieueral Purpose .Xualojr Computer, Bell bah. Record, 29, 



I)|). 101 lOS, Mar., n)51. 



7. Iv Lakatos, Problem Solviiifi witli I lie An.dofi Compuler, I'xdl bah. Record, 



29. pp. 1(M)-114, Mar., 1951. 



8. K. K. Sumiior, Relay Armature Rehound Aiialvsis, B. S. T. .1., 31, pp. 172 200, 



J.aii., PJ.W. 



