p.13 #1219 Interior of Diversion Tunnel No.3, near upper portal. Invert and side wall sections of three-feet thick concrete lining have been poured. Jun. 2, 1932 p.13 #1289 Interior of Diversion Tunnel No.3, showing method of pouring alternate slabs in side wall section of tunnel lining. Lining form is shown in background. Jun. 22, 1932. p.13 #1220 Interior of Diversion Tunnel No.2, near upper portal. Invert and side wall sections of lining have been completed. Two cubic yard buckets for pouring concrete are shown on truck. Jun. 2, 1932. p.13 #1273 Detail pic, showing method of construction and operation of side-wall jumbo for placing lining in diversion tunnels. Jun. 29, 1932.