16 



BELL SYSTEM lECIIXlCAL JOURNAL 



entirely new type of structure composed of parts that could be made 

 easily by the punch press method, and it was then necessary to de- 

 termine the modifications which must be made in such a structure, 

 in order that the proportions of copper and iron required for any one 

 of a number of design coiuliiions might be obtained. % 



The design of a piinclied t\|)e relay was first attempted in an 

 etTort to tiiul a heller rela\- than the liru- rela\-, and with the intention. 



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FIk. 10 — I-'irst |iiiik1h(1 fianic relay 



if the design were successful, of eniplo\ing thi- same slnuiiirc witli 

 a different winding as a substitute for the culolT ri-la\'. It will be 

 remembered that the line relay had a gra\it\' t\()e armature, whereas 

 the culolT rela\- had a reed-hinged armature so the effort to replace 

 two rela>s of different construction by a single structure was the 

 Ijeginning of an attempt to standardize a l\pe of rela\' structure 

 which could be used universalK . 



After some \ears of (le\elopineiU work, .i commercial design was 

 comi)Ieicil and punched-type relays were producetl as substitutes 

 for the line .mil cutolT relavs. The structures were exactly alike, 



