2.The setup for measurement of linear expansion coefficient is shown in Figure 3 The copper rod is heated by hot water(supplied by type 501 super thermostat). Measure the temperature by alcohol thermometer The bottom of the rod is placed on a sharp base and cannot be moved.The top of it can freely extend inside the tube. The rod is surrounded by cylindrical tube,which has spiral pipes inside,heating the rod by hot water that flows through. 3.The apparatus of the optical lever is shown in Figure 3 The apparatus includes telescope,scale and mirror. D 热水入口 /试样套管 温度计 热水出口 Figure 3 Apparatus of Linear Expansion Coefficient and optical lever Content: 1.Adjust the optical lever to the state to be measured,read Xo at room temperature. 2.Adjust the control temperature of thermostat to 10C higher than the room temperature and open the power of thermostat. 3.Measure the temperature T(when stable)of the copper rod.Measure the length increase of the rod△L. 4.Follow the same step,measure the length increase at every temperature 100C higher than previous one.Altogether repeat 7-8 times. 44 2. The setup for measurement of linear expansion coefficient is shown in Figure 3 The copper rod is heated by hot water (supplied by type 501 super thermostat). Measure the temperature by alcohol thermometer The bottom of the rod is placed on a sharp base and cannot be moved. The top of it can freely extend inside the tube. The rod is surrounded by cylindrical tube, which has spiral pipes inside, heating the rod by hot water that flows through. 3. The apparatus of the optical lever is shown in Figure 3 The apparatus includes telescope, scale and mirror. Content: 1. Adjust the optical lever to the state to be measured, read X0 at room temperature. 2. Adjust the control temperature of thermostat to 10oC higher than the room temperature and open the power of thermostat. 3. Measure the temperature T (when stable) of the copper rod. Measure the length increase of the rod ΔL. 4. Follow the same step, measure the length increase at every temperature 10oC higher than previous one. Altogether repeat 7-8 times. 3 2 1 0 1 2 3 D 试样套管 温度计 热水入口 热水出口 R 光 S Figure 3 Apparatus of Linear Expansion Coefficient 附图2 线膨胀系数仪及光杠杆装置 and optical lever