1923] 



CORWIN, IN SEARCH OF SLIDE MATERIAL 



69 



pick while lying on their side, but with energy conserving, electrically 

 operated mining machines. Some were operating electric rotary drills, 

 while others were loading empty cars with chunks of coal blasted 

 down the night before. The fact that the writer was not equipped for 

 underground photography was offset by the Company's loan of pic- 

 tures of mining operations. Tipples (see figure 36) with their comple- 

 ment of dumpers and screens were studied, and to complete the story 

 of the mining and handling of soft coal, the writer was taken to the 

 coal shipping dock at Fairport Harbor, Ohio, to see coal put on board 

 vessels with the loading machine, which lifts the whole car of coal to 



Fig. 37. — Looking down the Ohio River, formed by the Allegheny River 

 (right) uniting with the Monongahela River (left) 

 at the "Point," Pittsburgh, Pa. 



dumping position, and then turns it upside down, pouring the coal 

 onto an apron down which it glides into the hold of the ship, throwing 

 out an effective screen of fine, black dust. 



Pittsburgh was rich in slide subjects. In addition to the soft coal 

 mines, there were in the near vicinity natural gas and petroleum fields 

 and many industrial plants differing from those of Milwaukee. More- 

 over the Pittsburgh region presents an unusual topography as seen 

 from figure 37 and has an interesting pre-Revolutionary history. The 



