may be said to have revolutionized the mill conditions of 
the steel industry. The business was originally established 
in 1837 as the S. Jarvis Adams Co., which was incorporated 
in Pennsylvania on October 18, 1899. In October 1912, 
the name was changed to the Pittsburgh Iron & Steel 
Foundries Co. 
PITTSBURGH MALLEABLE IRON COMPANY 
The Pittsburgh Malleable Iron Company was organized 
in 1889, and in its foundry at Thirty-fourth Street, Pitts- 
burgh, 300 men are employed, and its capacity is 500 tons 
of castings per month. At the foundry at Zanesville, 0, 
the Zanesville Malleable Company employs 300 men, and 
ts capacity is 500 tons per month. The product of both 
foundries is general malleable castings. Incorporated under 
the laws of Pennsylvania and has a capital stock of 
$300.000. 
PITTSBURGH ROLLS CORPORATION 
The works of the Pittsburgh Rolls Corporation are at 
Forty-first and Forty-second Streets and the Allegheny 
Valley Railroad, in Pittsburgh. It is the successor of the 
Seaman, Sleeth Company, which was incorporated in 
August, 1896, and manufactures rolls exclusively; consist- 
ing of patent semi-steel, chill and sand rolls and pinions, 
steel rolls and pinions. The Company was incorporated 
in Virginia, July, 1917, and has an authorized capital stock 
» £3.000.000. 
PITTSBURGH STEEL COMPANY 
The Pittsburgh Steel Company, with plants located on 
the Monongahela River at Monessen and Glassport, 
Penna., in the Pittsburgh District, is the largest independ- 
ent manufacturer in the world of wire, nails and fencing. 
Products consist of: basic pig iron; basic Open Hearth 
steel ingots. blooms and billets: basic Open Hearth wire