Recherche dans la collection - Quebec, Canada. Plan and section shewing top of No. 4 tower and proposed raised racers tinted blue for traversing platform as per circular dated 29th May 1860. To accompany F.A.E. 1866-7. R.E. Office, Quebec, 6th Feby. 1866. Sd W.H. Head, C.W. J. Coffy, Sergt R.E. [architectural drawing]