New ideas and discovery

 THE CARNOT CYCLE       sadi carnot, a french engineer, proposed a reversible  cycle in 1824, in which the working medium receives heat at higher temperature. the cycle will consist of two isothermal and two reversible adiabatic processes as shown in figure. carnot cycle is represented as a standard of perfection and engine can be compared with it to judge the degree of perfection. it gives the concept of maximizing work output between two temperature limit. carnot cycle

         The power screw are used to convert rotary motion into translatory motion. for example , in case of the lead screw of lathe, the rotary motion is available but the tool has to be the advanced in the direction of the cut against the cutting resistance of the material.                  In case of of screw jack, a small force applied in the horizontal plane is used to raise or lower a large load. power screws also used in vices, testing machine, presses, etc.        power screw also known as translation screws .