This locomotive is the design of Mr. Henry F. Shaw, of Boston.
This engine has oscillating cylinders placed between the driving-wheels.
Fig. 2 represents a section of one of these cylinders, from which it
will be seen that each has two pistons and piston-rods, which are
connected directly to the crank-pins. His invention is described as
follows in his specification:
"Midway between each set of wheels, e and f, is located the oscillating
steam-cylinder, g, having its journals, g' and g", supported in the
stationary arm, h, which is secured in a suitable manner to the frame,
c. To each cylinder, g, is secured or cast in one piece therewith a
balanced vibratory beam or truss, i, as shown. Within the cylinder, g,
are two movable pistons, k and k', Fig. 2, provided with piston-rods, l
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'.
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