An apparatus for measurements of the heat capacity and the pressure coefficient of liquid He
4 under pressure is reported. A tunnel diode oscillator is used to measure the change of the pressure. The frequency resolution and the reproducibility of the oscillator for pressure measurements are found to be 1×10
-8 and 5×10
-4, respectively. The temperature resolution of the system is 4×10
-7K and the measurable range of pressure change is from 2×10
-6bar to 30bar.
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