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The Kingston and St. Andrew Building Act
pression 1 14 3 600 | 720 60 12 1 2 4 500 {| 600 50 15 1 3 6 375 | 450 40 20 if made of broken brick the stresses allowed are to be 75 per cent of the above stresses and the fraction ms/mc is to be taken at 30 per cent above the figure given