Current with a Magneto-Telephone Transmitter. 395 



Table I. — Core, Norway Iron. — Diaphragm, Disk of 

 Ferrotype Iron, No. 31. 



Strength of 



Induced 



Strength of 



Induced 



field. 



current. 



field. 



current. 





0-7 



•211 



20-5 



•oie 



3-3 



•229 



19-8 



•044 



12-0 



•248 



19-2 



•058 



19 3 



•270 



18-7 



•089 



23-3 



\ ^302 



180 



•118 



270 



•342 



16-9 



•141 



26^8 



1 -390 



16-1 



•132 



266 



' -454 



14-7 



•146 



25 3 



•530 



13-3 



•164 



23-8 



•625 



12-7 



•182 



22-5 



■773 



12-0 



•196 



21-6 



1014 



11-5 



Cores of Bessemer steel and of iintempered soft steel were 

 also used, with results given in Tables 11. and III. 



Table II. — Core, Bessemer Steel. — Diaphragm, Disk of 

 Ferrotype Iron, No. 31. 



Strength of 



Induced 



Strength of 



Induced 



field. 



current. 1 



field. 



current. 



•005 



20 



•279 



17-8 



•030 



7-7 



■333 



16-7 



•082 



20-7 



•396 



15-0 



•137 



26-7 



■507 



135 



•160 



24-8 



•625 



1L7 



•191 



21-2 



•748 



10-8 



•213 



19^3 



•907 



9-7 



•248 



18-6 



1-099 



8-7 



Table III. — Core, Uutempered Soft Steel. — Diaphragm, 

 Disk of Ferrotype Iron, No. 31. 



Strength of 



1 

 Induced 



Strength of 



Induced 



field. 



current. 



field. 



current. 



•031 



8-2 



•275 



18-0 



■049 



120 



•321 



16^5 



•089 



22-0 



•388 



16-2 



•137 



25 9 1 



•473 



13-8 



•157 



24-9 



•618 



127 



•171 



22-9 



•776 



ll-O 



j ^194 



21-1 



1-01 1 



9-5 



! ^216 



19 7 







