172 E.. H. Hali—New Action of Magnetism 
This second plate of gold leaf was not constructed until after 
several thick plates had been tried and found to give very dif- 
ferent results from those obtained with the first thin plate in the 
manner described above. Thinking that some experimental 
nto 
tions with the same plate, but using the low resistance galva- 
nometer. The results were, the thickness here also being 
estimated as above described, 
March 18, with high resist. galv., = oid = 622 X 10” 
“ “e “ee ‘74 “ oo 637 ed atk 
og Ge:) tr seat 6: err er 88h) es os 
Mean $i) Bee 64T C10" 
ance are evident; Ist, gold leaf so thin as to be transparent 
is by no means continuous, but is perforated by a multitude of 
small holes, so that the electricity is, as it were, obliged to wind 
or zigzag its way through the strip, thereby having a longer 
path and meeting a greater resistance, than if it could pursue a 
direct course: 2d, gold leaf is an alloy about twenty-three 
carats fine, and the resistance of such alloys is often much larger 
than that of either of the pure metals: 38d, it is difficult to se- 
u contact at the ends of the strip. In the plate under 
consideration this contact was probably very bad, and may have 
been many per cent of the whole resistance of the plate as 
measured. 
