216 



PROCEEDINGS OF Till: AMERICAN v LDEMY. 



Length of windings 

 ( Intside diameter 

 Inside diameter 

 Number of turns 



485.3 cms. - 1.0 ft. 11 ,',, in. 



5.96 cma 



2.86 cms. 



L0452 for each of the two coils. 



I ABLE VI. [No Fioubb.] 



November G, 1906. 

 Diana. = 0.2381 cm. = 3/32 in. 



R] VERSALS. 



The two coils were used in parallel, 80 that the magnetizing field is 

 //' — 27.064 ag.s. units for each ampere. 



The first rod tried in this solenoid was one of 0.9525 cm. diameter 

 (= | inch), and was a complete failure, although it gave some very 

 interesting results. No two consecutive step method magnetization 

 curve- would agree. The rod was 15 feet long, so that m = 480. 



