Note 3 — Chapter VII · THE EFFECT OF ALTERATIONS TO VALVE AND ECCENTRIC.

To make the idea clear one might plot these operations round a circle representing one revolution of the eccentric, when it would be seen that the operations of the valve could be considered quite independently of those of the piston—then it would remain to show what the piston might do, or have done upon it, by comparing its motion under varying conditions with the unvarying operations of the valve, in the manner explained later.