Portland Cement: Discussion on Mr Gutteridge's Paper

The President, proposing a very hearty vote of thanks to Mr. Creswell for having put the matter so clearly before the members, said he was wondering when structural engineers would have the opportunity to acquire legal knowledge in addition to all the scientific knowledge they must possess; perhaps the matter was one which might be placed before the Institution’s Board of Examiners. Mr W.C.Cocking(Past Member of Council) paid a tribute to Mr. Creswell in respect of his very happy knack of drawing the attention of professional men to various matters, often of very great importance, but which had previously escaped their attention, and said that the paper referred to many matters which professional men did not often consider.

We very much regret that the following printers' errors occurred in the December issue of The Structural Engineer :- Page 398- "Stewart & Partridges,Limited" should read "Stewart & Partners, Limited" Page 404- The figure "330 O.D." should read "300 O.D." Page 409-"Chief Surveyor" should read "Chief Quantity Surveyor" Page 42-"Breaking of cracks" should read "Breathing of Cracks".

To the Editor of The Structural Engineer. Water-Cement Ratio. Sir,-In reference to Mr. C S Gray’s letter,Professor Duff A Abrams states that "Aggregates of equivalent concrete making qualities may be produced by an indefinite number of different gradings of a given material." "Aggregates of equivalent concrete qualities may be produced from materials of widely different size and grading." "In general, fine and coarse aggregates of widely different size or grading can be combined in such a manner as to produce similar results in concrete." The meaning seems to point clearly to the fact that size or grading may vary widely in each aggregate, but not the different aggregates unless they have equivalent concrete qualities. W D Williams