Making A Compressed‐Air Tunnel: An Account of the Methods adopted in Constructing the Steel Shell for the New Tunnel at Teddington

IN view of the exceptional dimensions of the structure shown in Figs. 1 and 4, which will be described in this paper, the author thought that it might be of interest to the members of the Institution to have a short account of the difficulties which we experienced in meeting the requirements of the National Physical Laboratory authorities, and the various methods which were adopted to overcome them.