. Transactions . to all appearances will Fowler, Engineers). outlast another 4 sets. These are shown in Platein. by Fig. 2. Fig. 1 insame plate shows the wear ofordinary steel. Belfast Harbor Com- 24 Manganese- 8 months. Worn ^^. missioners. (Mr. T. steel. R. Salmond, Engi- Ordinry steel 8 months. Worn f. neer). 1 Manchester Ship Canl. 1779 Manganese- 4 mouths. Very little worn. (Mr. Wills, Eng.) steel. Phosphate Mining Co. 250 Manganese- Will la-st four times as South Carolina. steel. long as ordinary steel. * Mr. Pawleys series of very careful tests clearly shows that manganese-steelwor
. Transactions . to all appearances will Fowler, Engineers). outlast another 4 sets. These are shown in Platein. by Fig. 2. Fig. 1 insame plate shows the wear ofordinary steel. Belfast Harbor Com- 24 Manganese- 8 months. Worn ^^. missioners. (Mr. T. steel. R. Salmond, Engi- Ordinry steel 8 months. Worn f. neer). 1 Manchester Ship Canl. 1779 Manganese- 4 mouths. Very little worn. (Mr. Wills, Eng.) steel. Phosphate Mining Co. 250 Manganese- Will la-st four times as South Carolina. steel. long as ordinary steel. * Mr. Pawleys series of very careful tests clearly shows that manganese-steelwore nearly three times as long as ordinary steel, to say nothing of the extralabor and expense incurred in repairing and replacing the latter. Thus it maybe considered that the difference in favor of manganese-steel is at least 4 to 1,and this quite apart from the dredgers requiring no replacement of pins for sucha long continuous period. 168 IRON ALLOYS WITH REFERENCE TO MANGANESE STEEL. Plate 1. Fig. Comparative Wear of Dredger-Pins. Fig. 1, ordinary steel; Fig. 2, raanganese- steel. Mr. R. Pawley, of the Hull docks, reports a curious circumstancein connection with the use of these manganese-steel pins: Curiouslyenough, although we find that manganese-steel pins are so muchharder, there is actually less wear on the bushes of the link than withthe ordinary steel pins. Tlie excellent results detailed in TableIII., and the result noticed by Mr. Pawley, indicate the value to theconstructive engineer of the future of a material possessing in itsforged and toughened condition a tenacity of 58 to 65 tons persquare inch, a ductility of 40 to 50 per cent, on 8 inches, and yet atthe same time exhibiting such exceedingly high resistance to wearand tear. Increasing speeds in machinery of all classes require an IRON ALLOYS WITH REFERENCE TO MANGANESE STEEL. 169 increasingly strong material in their construction. It is quite prob-able that when manganese-steel is better understo
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
