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Silica forms 60 per cent. by weight of the earth’s crust, and as the Great Architect of the Universe has chosen silica for the frame of this earth, so the structural engineer, in his infinitely humbler capacity, uses it to form about 60 to 70 per cent. of the weight of concrete. E.F. Sargeant
With the extensive use of reinforced concrete for modern bridge construction, semicircular, segmental and semi-elliptical arches of brick, plain concrete or stone are much less frequently adopted for new works than was formerly the case; but the revival of road transport occasioned by the use of the petrol driven vehicle brings home to the structural and civil engineer the importance of the problem of the stability of the arch. Arthur A. Fordham
MR. FORDHAM, in a brief preface to his paper, said that those who had studied modern books on arches, and who were perhaps not very closely interested in arch theory, had been rather frightened off the subject by the calculus and by the algebraic symbols.