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INFLUENCE lines can be best studied and understood by first considering a simple span
having a single unit load travelling across it and noting the variation of stresses in all its members.
Detailed drawings of the test panels of brickwork, together with the numerical results
obtained in testing them, appeared in pages 379 to 384 of the Journal last month. These
are here followed by photographs showing the appearance of the cracks in the panels, from the front and from behind, after failure; the photographs are arranged in the same order as the drawings to admit of easy cross-reference,and in each case the Blue bricks are distinguished from the Flettons by a letter B. It is to be noted that in each case the bearing of the joist was uniform over the thickness of the panel, so that the cracks are ino way the effect of edge pressure.
The tendency towards standardisation, so marked to-day in all branches of engineering,
can be usefully carried out only to a certain extent in structural engineering. In
small structures, cost is saved if one is able to make use of standardised framework; butbeyond that, specialised design is an essential if efficiency is to be attained; and the larger the contract, the greater the need for the individual assessment of problems, and for seeking the most satisfactory solution.