Showing General View from Top Floor of the Old Tetryl Nitrating House Picture Shows the Excavation for Foundation Which is About 50% Completed Concrete Forms can be Seen to the Right and Left of Picture Building Checked in the Backgreound is the Azo Grinding and Mixing House, Showing a View of the Forms of the First Two Sections, Showing Progress of Work on the Above Project with Insley Concrete Hoists in Place Photograph shows Southeast Corner of Structure, Showing Western Wall of Storehouse after Forms had been Removed, Showing Preparations Being Made to Pour Concrete in Forms of New Bays, Showing Steel Forms in Course of Erection on Fifth Bay, Showing Concrete Walls on 8 and 9 Bays Completed, Showing North End of Completed Intermediates Stores Warehouse Also Shows Section of Broad Gauge Track and Concrete Road. Photographs by J. E. Griffith, H. F. Webb