Art.

 1 4| flowervase, and fitted it with a piston. He put a little water in
 2 4|        the cylinder, lowered the piston till it rested on the surface,
 3 4|         As the water boiled, the piston was raised to the top, while
 4 4|       leaving a vacuum under the piston. When the catch was released
 5 4|       the catch was released the piston made a powerful stroke,
 6 4|         But Savery did not use a piston Having got the vacuum, he
 7 4|    Newcomen did. He took Papin's piston and cylinder and made it
 8 4|    cylinder, C, in which works a piston, D. It will be noticed that
 9 4|          the top. The rod of the piston is attached to a beam, EE,
10 4|         of the atmosphere on the piston, and the weight F. finding
11 4|         the diagram, drawing the piston to the top of the cylinder.
12 4|        and creates a vacuum. The piston then makes its stroke, driven
13 4|       working .the stroke of the piston sucking the water up into
14 4| generated for each stroke of the piston. He compared this with the
15 4|        resist the descent of the piston. His first series of experiments
16 4|      clogged by vapour under the piston, and the only way to reduce
17 4|         were. Down will come the piston. The thing is done. " I
18 4|     atmosphere " to press on the piston and drive it into the vacuum.
19 4|     expansive, it pressed on the piston in exactly the same way
20 4|    stroke, the downward one. The piston was drawn up by a weight
21 4|       the boiler.l Now, when the piston was at the bottom, the steam
22 4|          devices for keeping the piston tight in the cylinder, and
23 5|          of his imagination. The piston must fit tightly in the
24 5|          lying on the top of the piston to prevent the passage of
25 5|       when he sent drawings of a piston and cylinder to be cast
26 7|        cylinder which caused the piston to jam. Wilkinson remedied
27 8|      this period, the rod of the piston was attached to the end
28 8|       pivoted at its centre. The piston rod must move in a vertical
29 8|          a curve. So long as the piston had only to pull on the
30 8|       which would not wrench the piston out of the straight.~Watt'
31 9|          a crank, which worked a piston, which acted in a pump.