5, and 2m = n) 131
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PARACHUTE HYDRAULIC MOTOR.
The very singular and simple hydraulic motor which we illustrate herewith
is the invention of a Russian engineer, Mr. Jagn. It is scarcely as yet
known in Western Europe, where, however, something will probably be heard
of it ere long. Its true field would seem to be Egypt, India, or any
country where canals or rivers are used for irrigation, and where it is
desired to draw water from them at particular spots in the simplest and
cheapest manner. At present in nearly all such cases water is raised by
hand or steam power; nevertheless it must be obvious that the current of
the canal itself, slow though it may be, is quite sufficient to raise a
small portion of the discharge to the very moderate height generally
needed to lift it over the banks into the adjoining fields. Why then is it
not employed for the purpose? The answer is obvious, when we consider the
various hydraulic motors at present in use. Of course, motors worked by
water pressure must here be excluded; and we are left with scarcely
anything but the undershot wheel, the turbine, and the screw pump. All
these require expensive buildings and erections to set them to work,
present but a very small fraction of their surface to the water at any one
time, and must be very large and costly if they are to draw even a very
moderate amount of power from such a source.
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