THE MONTHLY BULLETIN. 



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Fig. 111. — Drawing showing details of strainer box. 



College. ) 



(After Bui. 115, Penn. State 



OPERATION OF THE PLANT. 



Three men are required to work at the greatest efficiency: a boiler 

 man, who looks after the fire and has charge of the work; a man who 

 weighs the materials and mixes the sulphur with water; and a third 

 man who regulates the steam supply of each barrel during the cooking. 



