First the White-hot, Flowing Metal, Then the Mold, 



A ninety-ton steel crankshaft for an electric 

 power-house engine loaded on a pair of big gun 

 trucks. Compare this with the automobile 

 crankshaft from a sixty-horsepower motor. 

 The bolts are to secure the flywheel in place 



Below: Connecting rod for a large steel-mill 

 engine. Note the size of the nuts on the 

 bolts in the end where the man stands. The 

 connecting rod of a sixty-horsepower auto- 

 mobile is shorter than the crank-pin bearing 



Below: Rock crusher weighing 480,000 

 pounds, capable of crushing rocks as large as 

 pianos at the rate of a thousand tons a min- 

 ute. It is made almost wholly of steel castings 



Below. A flywheel weighing 120 tons which 

 is nearly thirty feet in diameter. It was turned 

 and made round and true in a great pit 

 lathe. It is mounted on a 90-ton crankshaft 



