Boiler Rivets.
I& some practical tests of the comparative value of drilling and punching rivet holes in boiler-plate made in London, the result was in favour of drilling and the use of one-third-inch rivets. In these facts all the pieces were from tho same sheet of five-eixteenths-inch boiler-plate and of one and thvee-fourfch-inch width. Three pieces were tern in two by hydraulic pressure at an average strain of 32,685 pounds ; three pieces punched, one five-eighths-inch hole in each piece, broke under an average tensile strain of 13,485 pounds; three pieces drilled, one five-eighths-inch hole in each, broke under an average tensile strain «J*J 7>6 f 6.,6 .,J po , un , t1 !- The ayo ™£ c strength of, the drilled plate was thus 4*160 pounds greater than that of the punched plate Three pairs of plates punched and riveted with the best five-eighths-inch rivets, one rivet to each pair, broke in the centre line ol hole, at an average strain of 17 549 pounds. '/>^*v
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Te Aroha News, Volume V, Issue 215, 13 August 1887, Page 7
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162Boiler Rivets. Te Aroha News, Volume V, Issue 215, 13 August 1887, Page 7
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