When the motor is arranged as shown in Figs. 1 and 2, or for the
transmission of motion by means of a band wheel, _p_, cast in one with
the flywheel, P, the disk which receives the crank pin of variable
position is fixed directly upon the axle, _d_, of the same flywheel
carried by the support, D; but when the motor can be applied directly,
as is the case for example in the Singer sewing machine, upon the axle
of the machine, no support is used, and the arrangement shown in Figs.
3 and 4 is adopted. In this case the disk, F', is cast with three arms
which serve, by means of a screw, to fasten it to the flywheel carried
by the axle of the sewing machine.

When the motor is used on the upper stories of buildings, the changes
of speed incidental to drawing the water from the lower stories from
the same pipe can be compensated by the use of an accumulator. This
accessory apparatus is composed of a reservoir of a capacity of 10
liters or more, intercalated in the pipe which supplies the motor, so
that the water coming from the principal pipe enters the bottom of
this reservoir, passing through an India rubber valve opening inward,
the supply for the motor coming through a tube always open and placed
above this valve. The air trapped in the accumulator is compressed by
the water, and when the pressure in the pipe decreases, the valve
closes and the compressed air drives the water through the motor with
decreasing pressure until normal pressure is re-established in the
pipes.--_Publication Industrielle._

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