The amplifier of the thermocouple vacuum gauge

The amplifier of the thermocouple vacuum gauge, which had given a million hours of service without failure. The unit was about 12 X 7 x 28 cm³. The thermocouple heater current could be adjusted on the front panel. The amplifier would read pressure or heater current and a lamp lights up when the pressure falls below the preset value. A diagram of the hydrogen target system which was to be installed inside the proton synchrotron ring at the end of 1969. The target itself, K, where the particle beam was directed, received its liquid hydrogen via the heat exchanger, J, where helium was circulated.