PROFESSOR THOMSON ON THE ELECTRO-DYNAMIC QUALITIES OF METALS. 671 
diictor composed of thirty slips of sheet iron, 
boiling by steam blown into it. 
6° running through the coolers. 
coolers Initial Ta=56°-44, Tb= 58°-28 ; Final Ta=48°-06, Tb=51°-59. 
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Started in the other direction and broken, several times ; and it was found that its absolute heating 
1 only commenced giving a stream through the coolers at the commencement of the second period. 
