163 



Length of solenoid, 9.5 cm. Number of turns, first coil 176, second coil 

 273. The force of the spring represented by one turn of the micrometer screw 

 is 13 grams or 0.028 lb. 



Record for a Cold Rolled Steel Rod 0.5 in. Diaiii. Coil 176 Turnip. 



2.5 I 



2.0 



1.6 



1.2 



0.8 



0.4 







32.0 

 28.0 

 27.5 

 23.0 

 17.0 

 6.0 

 1.0 



Pull in 

 Pounds. 



0.0000 

 0.0112 

 0.0840 

 294 



4761 

 0.6160 

 0.7840 

 0.9800 

 1.0080 

 1.0640 



1 (1640 

 1 . 0940 



1.0940 

 1.0040 

 1.0940 

 1.0360 

 0.8960 

 0.7840 

 0.7700 

 0.6440 

 0.4761 

 0.1642 

 0.0280 



.\mp. 

 I. 



0.0 

 0.4 

 0.8 

 1.2 

 1.6 

 2.0 

 2.5 

 3.5 

 4.5 

 5.0 

 5.5 

 6.0 



5.5 

 5.0 

 4.5 

 3.5 

 2.5 

 2.0 

 1.6 



0.8 

 0,4 

 0.0 



Pull in 

 Turn.s. 



1.0 



0.3 



2.5 



9.0 



18.0 



26.0 



28.5 



36.0 



40.0 



40.0 



40.0 



40 



40 

 40.0 

 40.0 

 :8.0 

 36 

 31.0 

 28.0 

 24.0 

 18.0 

 8.0 

 1.0 



Pull in 

 Pounds. 



0.028 

 0.008 

 0.060 

 0.262 

 0.484 

 0.628 

 0.798 

 1.008 

 1 . 120 

 1,120 

 1 120 

 1 . 120 



1.120 

 1.120 

 1 . 120 

 1.064 

 1.008 

 0.868 

 0.784 

 0.672 

 0.484 

 0.204 

 0.028 



.\iiip. Pull in 

 I. Turns. 



0.0 

 0.4 

 0.8 

 1.2 

 1.6 

 2.0 

 2.5 

 3.5 

 4.5 

 5.0 

 5 . 5 

 0.0 



1.0 



0.2 



2.0 



8.5 



19.0 



25.0 



30.0 



.35.0 



39.0 



40,0 



41,(1 



41.0 



Pull in 

 Pounds. 



0.028 

 . 006 

 0,056 

 0.238 

 0.541 

 0.700 

 0.840 

 0.980 

 1.094 

 1.120 

 118 

 1.148 



