THE GROWTH OF THE STEAM-ENGINE. 



S35 



necessary to train up a body of engine-drivers who should be capable 

 of managing these new engines, for they required the exercise of a 

 then unprecedented amount of care and skill. Finally, with the ac- 

 complishment of these two requisites to success, must simultaneously 

 occur the enlightenment of the public, professional as well as non- 

 professional, in regard to their advantages. 



Thus it happens that it is only very recently that the screw has 





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attained its proper place as an instrument of propulsion, and has only 

 now driven the paddle-wheel almost out of use, except in shoal water. 

 Now our large screw-steamers are of higher speed than any pad- 

 dle-steamers on the ocean, sometimes crossing the Atlantic from New 



