OF FERRUGINOUS BODIES. 235 
EXPERIMENT 5D. 
No. 1, Solid \End A, deflection 22° ey 
Iron Bar Cold./ End B, Slip Daas me 
White Hot ...... zero. Blood-red ...... 35° 
@odled to: Blscknesss) .2.6.5..650051..2)/23.2% 35° 
63. The general results of these experiments 
differ in no respect from those obtained by Mr. 
Barlow, as far as relates to the neutrality of iron 
when highly heated, and its acquiring a maximum 
of magnetic action at a certain degree of tempera- 
ture. But we do not learn from that philosopher’s 
account of his own experiments, that the iron is 
neutral at a bright red heat. The results now 
detailed, however, have shown that the iron is 
perfectly neutral even at a moderate degree of 
redness ; and it is not till the temperature falls to 
a dull red heat, that the needle indicates the slight- 
est movement from the meridian. It first moves 
slowly, till it arrives at about 5° of deflection ; 
stands fixed for a moment, and then travels ra- 
pidly to nearly the maximum point. 
