Bridge of 528 Ft. 3 Ins Span Over the Seine at La Roche Guyon

Author's Supplementary Remarks THE question of vibration is apparently exercising many minds at present, and since the time when my text was completed, further information has reached me from various quarters which enables me to add many items to the bibliography of the subject, such as was published in "Science et Industrie" of February, 1934, and to which I had referred our colleagues. This new list contains some fifty references, and is embodied as a note at the end of the discussion. It is not claimed that it is complete, but it is fairly up to date, and a good many new points have been brought out.

MR. REYNOLDS said that in presenting these observations of the New Code of Practice for Reinforced Concrete, his sole interest in the subject was the very personal one of attempting to interpret as a practising engineer the Code's recommendations.

Sir,-It has long been known that the modulus of elasticity in compression of concrete increases with the quality of the concrete and this has been recognised in the New Code.