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SIR,-I have read with interest Mr. Donovan Lee's observations on my article comparing fire-resisting with timber floors, and note that he agrees with my general contention on the advantages of the former in dwelling houses.
The author said that before showing the slides and dealing with the paper in general he wished to repair at least one of his crimes of omission. In dealing with the personnel of the job, unfortunately no reference had been made to Mr. W. K. Wallace, M.Inst.C.E., Chief Engineer of the London Midland & Scottish Railway, who was responsible for the preparation of the whole of the scheme when he was engineer of the Northern Counties Cormmittee. Although he left Belfast before the scheme had actually been put under way, most of the smaller bridges had already been designed and the general layout of the viaducts determined. Although he was not directly associated with the construction of the viaducts, his advice was always available and was frequently taken advantage of.
If the banks of a ravine appear to be solid and careful investigation has revealed no indication of slipping at any point above, below, or near the proposed location of the bridge the rock bed which is to sustain the thrust from the structure must be drilled and carefully examined its to its nature, strength and depth. If the results are satisfactory the designer can proceed with details to determine the type of structure which should be selected only after a minute analysis of the data obtained. H.E. Brooke-Bradley