and l', and cross-heads, m and m', as shown.

"n n are slides for the cross-head, m, on the insides of one end of the
truss or beam, i, and n' n', are similar slides in the other end of
said truss or beam, for the cross-head, m'. To the driving-wheel, e,
is attached a crank-pin, passing through the cross-head, m, and to the
driver-wheel, f, is attached a similar crank-pin, F, that passes through
the cross-head, m'. o is the slide-valve within the steam-chest,
G, which slide-valve is operated forward and back by means of the
valve-rod, o, the outer end of which is hinged to the upper end of
the slotted lever, o squared, Fig. 1, that is hung at o cubed, on the end of the
balanced and vibratory beam of truss, i, as shown. On the crank, F, is
secured an eccentric, that works within the slot of the slotted lever,
o squared, during the revolution of the crank, F, and in this manner imparts
the requisite motion to the slide valve, o, to admit the steam into the
cylinder, g, alternately between the pistons, k and k', and at the ends
of said cylinder, g, so as to alternately force the pistons, k and k',
from and toward each other, and thus, in combination with the vibratory
motion of the truss, i, impart a rotary motion to the driving-wheels, e
and f.

[Illustration: SHAWS OSCILLATING CYLINDER LOCOMOTIVE.]

"The steam is admitted to and from the cylinder, g, as follows: When
the pistons, k and k', are at the outer ends of their stroke the steam
enters through the channel, p, back of the piston, k, and at the same
time through the channel, p', back of the piston, k', and thus causes
both pistons to move toward each other, the steam between them being
at the same time exhausted through the channels, q and q', the former
communicating with the exhaust, r, by means of the space, s, in the