. Studies in physics. Internal heating vs I00°C. Z00°C. 300°C. 400C. 18 17xlO dynes per cm. --IG 15- n- Series 9External heating. lOOC, ZOOC. 300°C. 400°C I I 1 1 Fig. of Youngs modulus of a mild steel wire with temperature. stretched about one fourth of a millimeter, approximately .05 per cent,of its length. When the elastic limit is exceeded there should be anincrease of the modulus for all temperatures. The next observation atroom temperature showed an increase from to or per increase of the modulus for other temperatures as well can be seenfrom Fig. 2. The f
. Studies in physics. Internal heating vs I00°C. Z00°C. 300°C. 400C. 18 17xlO dynes per cm. --IG 15- n- Series 9External heating. lOOC, ZOOC. 300°C. 400°C I I 1 1 Fig. of Youngs modulus of a mild steel wire with temperature. stretched about one fourth of a millimeter, approximately .05 per cent,of its length. When the elastic limit is exceeded there should be anincrease of the modulus for all temperatures. The next observation atroom temperature showed an increase from to or per increase of the modulus for other temperatures as well can be seenfrom Fig. 2. The first three series of observations of Fig. 2 give the temperaturevariation of Youngs modulus with external heating. Series 11 shows thetype of curve, and the return of the modulus to the same value after aday of heating and stretching. Series 12 was taken under similar con-ditions. By yielding the same results it proves the total disappearanceof all history effects except the very gradual increase of the modulus withcontinued heating and stretching. As the observations for decreasingtemperature in the last two series were
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