Part, §

 1 Int    |       Humphrey Potter and the valve gear, and a point that strikes
 2 Int    |       IV., Frontispiece). His valve gear alone shows a difference
 3 Exp    |     weight of the air.~ ~F. A valve, loaded with a certain weight,
 4 Exp    |    boiler.~ ~H. A pipe with a valve to allow the steam to escape
 5 Exp    |   machine is stopped.~ ~I.K.A valve, provided with its cup and
 6 Exp    | sinking or waste-pipe and the valve at the end through which
 7 Exp    |       the puffing or snifting valve.~ ~X. A valve, called the
 8 Exp    |     or snifting valve.~ ~X. A valve, called the snifting or
 9 Exp    |       the snifting or puffing valve, because the steam expels
10 Exp    |  enter the cylinder.~ ~Y. The valve of the sinking-pipe, which
11 Exp    |       water spurts out of the valve at every stroke of the machine,
12   I, 10|  piston, through the snifting valve as soon as it gets into
13   I, 11|      much quicker through the valve as well as between the cylinder