ther on the base of
the cast iron bearing frame, D, of the main shaft, _d_, _d_, Figs. 1
and 2, or directly on the sewing machine table, Figs. 3 and 4, by
means of two pins, _e_ and _e'_, so that it can oscillate about an
axis which is perpendicular to the shaft, _d_, to which is attached
the disk, F, carrying the crank.

This arrangement of parts, in combination with the horizontal axis of
the distribution valve and with the piston rod, _g_, considered as a
vertical axis of rotation, forms a species of universal joint between
the crank pin and the table, so that it can be put in place without
adjustment by any workman, who only has to screw up the two screws,
_h_, to fasten to the table the standard, E, and the piece, E', in
which are screwed the pivots, _e_ and _e'_, which support the tank,
and this all the rest of the motor.

As is seen more clearly in Fig. 2, the water under pressure enters by
the pipe, _c_, to which is attached a small tube of India rubber, and
leaves by the pipe, _c'_, and is carried away by another India rubber
tube.

The openings of the distribution cock are symmetrically pierced in the
seat and plug, which latter is divided internally by a horizontal
diaphragm so arranged that at each oscillation communication is
established alternately above and below the piston. So that it can be
started or stopped quickly, the opening and closing of the throttle
valve, _i_ (Fig. 2), is effected by a single pulling movement upon the
handle, I, and this draws out the valve horizontally. For this end the
lever is pivoted upon the extremity of the valve stem, and ends in a
bar engaging with a fork which acts as its fulcrum. This fork is cast
in one piece with the plug, J, which closes the opening through which
the valve is put in place, as shown in detail in Fig. 8. To prevent
the lever from spinning out of the fork when it is pulled or pushed,
this lever is prevented from turning by the valve stem, provided for
this purpose with a double rib, _i'_ (Figs. 2 and 8), which engages in
slots in one piece, _j_, secured in the interior of the plug, J.

Lest the friction of the conical distribution valve oscillating with
the cylinder should occasion a loss of power, care is taken to leave
the key free in its seat, _b_, by not forcing the pivot, _k_ (Figs. 1,
3, and 5), whose position in its seat is regulated by the screw, _k'_.
It follows that a very slight escape of water may be produced, but
that does no harm, a