iron and steel was 369, of the nation’s total, and was 
distributed as follows: 
Allegheny County, 6,881,129 tons; Shenango Valley, 
1,082,790 tons; other Western Pennsylvania plants, 2,449,- 
461 tons. Other percentages of the total American pro- 
duction emanating from Pittsburgh are: steel cars, 509; 
tin plate, 609; crucible steel, 609; pipe and tubing, 45%; 
vanadium, 909%; radium, 85%. 
Pittsburgh leads the world in tonnage. In the pre- 
war period the tonnage of Pittsburgh was figured at 
175,000,000 tons, while during the war the volume of 
tonnage handled increased tremendously. By way of 
comparison, it is computed that the tonnage of the four 
largest naritime ports of the world—New York, London, 
Marseilles and Liverpool—was less than half that of 
Pittsburgh; the total for these four ports being placed at 
34,376,000 tons, while the tonnage passing through the 
Suez Canal, a world-shipment route, was 26,000,000 tons. 
The Pittsburgh district is the most important Steel 
foundry center in the United States, there being a larger 
tonnage of castings produced in this district than in any 
sther industrial community. 
Some of the important manufacturing corporations in 
the Iron and Steel industry, together with a brief enumera- 
tion of the numerous varieties of articles fashioned by 
them, and sold in all quarters of the globe, are alphabetically 
considered in this issue of “The Story of Pittsburgh.” 
ALLEGHENY STEEL COMPANY 
The Allegheny Steel Company was organized in 1900, 
and began to operate in August, 1901, with about 300 em- 
ployees. This number has gradually increased until 
about 3,000 are now employed for normal operation. The 
capital stock at the time of organization was $300,000, 
and this has been increased to $3,500,000, although the 
amount invested is much larger. For the first two or 
three years light steel sheets only were produced. Then 
a plate mill for the production of tank and structural steel