§ 71. Mr. Parkerasked the Lord Privy Seal why normal engineering practice has been departed from in the Home Office Specification, etc., in regard to permanent lining of trenches, reissue of January, 1939, where the specification allows 25 per cent. greater stresses than standard practice permits in spite of the fact that the trenches may have to stand up to more than normal stresses?
§ Sir J. AndersonIt would be difficult to say that there is any code which represents normal engineering practice in construction of this kind; and I am advised that the safety factor provided and described by reference to certain codes established for other purposes is sufficient for this purpose.
§ 72. Mr. Parkerasked the Lord Privy Seal whether the second issue, January, 1939, of the Home Office document entitled 1086 Specification, etc., in regard to permanent lining of trenches, specified stresses 25 per cent. in excess of normal practice instead of the safety factor of three which was specified in the original issue, November, 1938, in order to cover errors of calculation made in the preparation of such original issue, and will be make a statement?
§ Sir J. AndersonI am assured by my technical advisers that the change in this case is one of language only.