Art.

 1 4|      simply a question of the pressure of the atmosphere. The air
 2 4|      is exerting a continuous pressure in all directions. As it
 3 4| objects it surrounds, for the pressure is perfectly balanced. But
 4 4|     is nothing to balance the pressure on the other. The body is
 5 4|     with a force equal to the pressure of the atmosphere. Here
 6 4|     to the use of atmospheric pressure to drive a machine was the
 7 4|    stroke, driven down by the pressure of the atmosphere which
 8 4|      the steam again, at high pressure, and it acted on the water
 9 4|       drive his engine by the pressure of steam itself. This seems
10 4|   vacuum, and so bringing the pressure of the atmosphere into play.
11 4|    steam must be used at high pressure. Now in the eighteenth century
12 4|     that, when subjected to a pressure lower than that of the atmosphere,
13 4|      water will boil at every pressure from nil upwards. In his
14 4|   cylinder. This balances the pressure of the atmosphere on the
15 4| stroke, driven by atmospheric pressure, and so raises the pump
16 4|       an engine driven by the pressure of steam alone, the first
17 9|      into the factories where pressure of public opinion and legislation