Collection search - Quebec. Sketch shewing carronade battery and guard house with fissures in the cliff. Also a pencil sketch shewing a design for removing that portion of the line wall now in the position considered most dangerous as well as the battery and guard room and for closing up the work with a flank and guard room in a position beyond the extent of the present fissures. H.P. Wulff, Lt. Col., C.R. Engr, Canada East, 7 March 1853. [architectural drawing]