Chemistry and Physics. ar 
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], the steady-pin is marked ‘I. 
second. 
“A similar accident happened thrice to our turbines, which are now, 
: ” 
aps. 
‘ly ral No ‘ 
highest temperature attained, must have been fully supplied by the heat 
generated ese the same time; and this must, therefore, have been 
_ evolved with equal rapidity at the surfaces of friction. No change in 
molecular condition of the iron, and no abrasion of oe metal, is at 
