The fire grate is placed in the interior of the
cylinder, and is traversed by the cold air forced by a pump. The
expanded hot gases fill the cylinder and act against the piston
directly above the grate.
The type herewith illustrated is of 6 horse power. The motive
cylinder, CC', is bolted to the extremity of the frame, A. Upon this
latter is fixed a column, B, which carries a working beam, E. This
latter transmits the motion of the piston, P, to the shaft, D. A pump,
G, placed within the frame, forces a certain quantity of cold air at
every revolution into the driving cylinder. The piston of this pump is
actuated by the connecting rod, G', jointed to the lever, F', which
receives its motion from the rod, F. A slide valve, _b'_, actuated by
a cam, regulates the entrance of the cold air into the pump during
suction, as well as its introduction into the cylinder. There is a
thrust upon the piston during its upward travel, and an escape of hot
gas through the eduction valve, _h_, during the downward travel.
The cylinder is in two parts, C and C'. The piston, which is very
long, rubs at its upper end against the sides of the cylinder, C. The
lower end is of smaller diameter, and leaves an annular space between
it and the cylinder.
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