1923] CORWIN, IX SEARCH OF SLIDE MATERIAL 71 



of converting soft coal into coke in the longest series of Beehive ovens 

 in the world, — 333 ovens extending for a mile along the base of two 

 low hills. On the day of the visit 303 of the total number of ovens 

 were in operation (see figure 39). This plant was examined and photo- 

 graphed through the courtesy of the H. C. Frick Coke Company. 

 Later the manufacture of coke in By-products ovens of the Koppers 

 type at Clairton was demonstrated to the writer through the kindness 



Fig. 39. — Quenching the coke at Beehive ovens, 

 Connellsville, Pa. 



of the Carnegie Steel Company, operating 768 ovens in one gigantic 

 plant, the largest known anywhere at the present time. 



Still another day was put in at the Edgar Thomson Steel Works, 

 a subsidiary of the Carnegie Steel Company, at Braddock. Here the 

 course of the iron ore was followed through the blast furnace, Bessemer 



