Partly visible at the lower left and held on with clothespins is a manifold for measuring peak positive and negative pressures with a manometer. The pressure tap is routed through one of two one-way valves and then to the manometer. This arrangement allows the manometer to track peak pressures at higher RPM than is possible by direct connection to he manometer.
Stirling Engine setup for measuring power output. The postal scale measures torque generated by the friction of the arm clamped to a sleeve on the creanksaft. The tachometer (small red device) displays RPM. A thermometer displays the temperature of the water heated by the heat lamp. I use an infrared thermometer to measure the cold sink below the displacer.
