A brief survey of design practice reveals different design methods in Britain and America and some difference of opinion among engineers in Britain. The results of 18 tests are reported which show that American practice gives reasonable safety and economy. They indicate, however, that British practice gives conservative results if CP I10 bond stresses are used but, where base thicknesses are determined from consideration of shear stresses, results with varying margins of safety are obtained. It is suggested that CP 110 should be modified so that safe, but reasonably economical, base thicknesses are obtained.
A.W. Astill and D. K. Absajir