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SIR,-Since writing the letter published over my name on page 535 of the November 1932
issue of The Structural Engineer, the London County Council, in the exercise of its powers under section 58 (3) of the London Building Act, 1930, has recently imposed important conditions when granting a consent to waive the provisions of the Third Schedule to such (2) that all floor constructions (other than
Act (except as regards the encasing of steel-work, paragraphs 3 and 4) so as to permit the required to carry a superimposed load of more
use of the provisions of the Code of Practice approved by the Council on February 16th, 1932 (with the exception of clause 12 of such code).
These notes, collected over a period of some twenty-five years in Great Britain, Europe, and the United States, are the more interesting items in connection with structures of reinforced concrete and steel and their equipment.
Suspension Bridge with a hinged stiffening truss. The main suspension cable consists of links a, b, c, d, e, f, h, j and k and is assumed to be connected to rigid supports at (a) and (k). Vertical suspenders connect the cable to the stiffening girder which is hinged at the mid point of the bottom chord. No suspender is assumed to act at this hinge. The left hand end of the stiffening girder is hinged to supports while the right-hand end is allowed to move horizontally.