of an Electric Current by Magnetic Action. 121 
By calipers the ee _aubyered to be at one end ‘0046; 
bet 
other end +004 0048; average ‘0046. Take 
then Ae true a tenon arms “00476. 
measurement with calipers in this case was not made with 
great care, and the correction here applied is open to some sus- 
pici 
With this “cna the space between the brass strips B, B (fig. 1) 
was about 3-2 
Be(N9.: 4s) 
Length of main strip when weighed -.-..- .--- 4°58 cm. « 
Width of main strip when weighed .......-. 1°08 em 
Area, including that of the arms 
Wei eight 
58 
siete ag Ripe ro He “00403 cm. 
indications of the calipers I concluded that the 
ween - e arms was about 1} per cent greater ae 
the 
1 between the arms, ‘00409 cm. This value, 
ike that given for A, may be wrong to the oxtenk of Pra per 
Distance between strips B, B, about 3°2 ¢ 
C. (No. 1.) 
Length of main strip when weighed-..-..---- 3°75 cm. 
Width of main strip when weighed --------- 1°08 cm. 
Area of whole strip when weighed .--..----- 4°39 cm. sq 
ch Jeaile. oo3 sodied ts gout: usec “1085 grm. 
NYC kul cc pal shane ee ele ete “44 
ieetaze thickness from these data --..-.----- 00292 em. 
ben! calipers thickness at one end, -0034; at other end, Pe et 
Ween arms, -0034; average, 00333 cm. Take then for tru 
thickness between arms ‘00299 cm. Distance between ater 
B, B, about 3 em. 
DD. GNe. 1.) 
Length of main strip when weighed. --..----- 3°86 cm. 
Width of main strip when weighed --.-.----- 1:07 cm. 
Area e whole strip -.-- _... 4°45 cm. 8q. 
tes Ce ME ss PN 8s 1c. 1 ee, 
ity Spach fe Sea pm gion es Re yee Si yh 8°3 
erickes thickness from these data ...-.----- 00291 em. 
betes Calipers thickness at one end, 0030; at other end, °0030; 
een arms, 0032; average, (00307 cm. Take for true thick- 
~lhgehbaae ag kt -00304 cm. Distance between strips B, B, 
about 3-2 ¢ : 
