Translations:Thermodynamic and Mechanical Study/6/en

• $S$: small cylinder;
• $L$: large cylinder;
• $H_i$: heat-in exchanger, located on the $S\to L$ hydraulic path and transferring heat into the gas;
• $H_o$: heat-out exchanger, located on the $L\to S$ hydraulic path and transferring heat out of the gas.