Roadway trusses for the Mackinac Bridge (14 of 21)

Workmen use a torque wrench to tighten bolts to the proper specifications., Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Workmen use a torque wrench to tighten bolts to the proper specifications.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1956 (approximate)