. Railway mechanical engineer . It is difficult. Zone Test pieces Original 1. 23 E 4, 7, 13, 15 C & D 5, 6, 9, 14 Tensilestrength Elasticlimit Elongation Reductionof area HardnessBrinell Scleroscope Modulus ofElasticity Modulus ofResilience 125,,800 per per cent per per per cent 263 43298 49245 40 28,950,00029,990,00029,950,000 metal may, therefore, he expected to show some lack of uni-formity in hardness. If, however, the metal at approximatelyequal distances from the line of the critical range be co

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. Railway mechanical engineer . It is difficult. Zone Test pieces Original 1. 23 E 4, 7, 13, 15 C & D 5, 6, 9, 14 Tensilestrength Elasticlimit Elongation Reductionof area HardnessBrinell Scleroscope Modulus ofElasticity Modulus ofResilience 125,,800 per per cent per per per cent 263 43298 49245 40 28,950,00029,990,00029,950,000 metal may, therefore, he expected to show some lack of uni-formity in hardness. If, however, the metal at approximatelyequal distances from the line of the critical range be com-pared, it will l)e seen that the liardness is as uniform asmight be expected. in some cases, at either of these powers, especially the higherone, to select a representative field, because of the greatvariation in even a short distance; but an endeavor was madeto come as close to the desired result as possible, a numberof photomicrographs being made from each test piece, and 108 RAILWAY MECHANICAL ENGINEER Vol. 92, No. 2.

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