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 production
 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 prewar
 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 enumeration
 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 employees.
 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