of an Electric Current by Magnetic Action. 127 
make the slight changes necessary to deduce from the observed 
results the values of the R. P. at 28°. 
“ihe steel used in this series of experiments was obtained 
m 
tough to be quite readily cut with a pocket knife. The first 
Strip to be described was tested in this “ natural ” condition. 
Length of main strip when weighed ---- -- ---- 4°15 cm. 
Width of main strip when weighed -_.------- 1°10 cm. 
Area of whole strip when weighed. ..... .--- 4°88.sq. cm. 
Oe cc. Carer renee a Bos a 21 grm. 
EA een oat Paha ea lguiances ON EGRS 
Average thickness from these data. .-.-.----- 01092 cm 
Estimated thickness between arms_-_--------- 01116 cm 
meetice from B to B, about,....s--..---.--- 31 em 
No. 2 (tempered.) 
The dimensions of this strip were not so carefully taken. 
It was so brittle that I felt obliged to use caution in applying 
the Calipers to it, It appeared to be of about the same (HSI 
... “8 No. 7 and I assumed it to have exactly the same thick- 
ness, The distance from B to B was about 2°6 cm. 
