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To the EDITOR of The Structural Engineer. SIR,--Professor Abrams has stated that with a given fineness modulus and water-cement ratio, the strengths of concrete produced from a widely varying range of aggregates will be the same.
HISTORY is something more than the irrelevant repetition of events which have "gone through the formality of taking place;" it must have significance to the historian, and to his audience. Of all events which are worthy of record few can have greater interest for the engineer than the discoveries of Science, and the inventions of Technology, on which the activities by which he earns his daily bread are based; and yet how few engineers know whence the current practice of their profession is derived, or realize the epic struggles of their predecessors to achieve results which have become part of the commonplace routine of present-day design, manufacture or fabrication. S.B. Hamilton
Mr. Jackson added to the paper the following extract from the Kelvin Lecture of last year, delivered by Professor W. L. Bragg to the Institution of Electrical Engineers :-