123 
of hot iron between the white and blood-red heat. 
j 
lasted about two minutes more, when the usual attraction took 
place: this sometimes arrived at its maximum very rapidly, 
but at others it proceeded increasing very gradually ; and 
commonly within the time stated above, the needle had been 
found perfectly stationary. 
In the table, to avoid confusion, that attraction which took 
place according to the known laws of cold iron is marked 
plus, whichever end of the needle approached the iron, and the 
opposite attraction is marked minus. For example, when the 
compass is above the centre of the bar, the north end of the 
needle should be drawn towards the iron, but when the com- 
pass is below the centre, the south end should approach the 
iron; these therefore are both marked plus, and the contrary 
attraction at the red heat is marked minus. 
