. Studies in physics. ternal and internal heating and showed a practically linearrelation between Youngs modulus and temperature. Series 5, Fig. I, ,76 H. L. DODGE. rSecondLSeries. was with external heating, increasing and decreasing temperature. Series6 and 8 are plotted together. They were with internal heating, increasingand decreasing temperature. The results of the first eight series show thatfor temperatures below 3000 C. the elasticity is a definite function oftemperature, independent of manner of heating and free from any hys-teresis effects. It was next thought desirable to extend the
. Studies in physics. ternal and internal heating and showed a practically linearrelation between Youngs modulus and temperature. Series 5, Fig. I, ,76 H. L. DODGE. rSecondLSeries. was with external heating, increasing and decreasing temperature. Series6 and 8 are plotted together. They were with internal heating, increasingand decreasing temperature. The results of the first eight series show thatfor temperatures below 3000 C. the elasticity is a definite function oftemperature, independent of manner of heating and free from any hys-teresis effects. It was next thought desirable to extend the temperature range by aconsiderable amount and to repeat the tests in various orders to ascertainwhether the same relations hold for a greater range of heating above 3000 C. a very rapid decrease of the modulus wasdiscovered, the rate of decrease becoming very marked at about 4500 results are shown in Fig. 1, series 9. At this temperature the wire -17 Sen External heating 7S\ ICOC. ZOOC. 300° Internal heating vs I00°C. Z00°C. 300°C. 400C. 18 17xlO dynes per cm. --IG 15- n- Series 9External heating
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