The 5' x 7' transverse gallery in block 22, elevation 900, looking upstream.
Description
Workers shown here are preparing to pour the transverse gallery in block 22 using timber molds of the tunnel to structure the concrete for the archway and walk space.
To order a reproduction please see: http://www.libraries.wsu.edu/masc/ , or contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
Rights
For permission to publish please contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
