Their diameter,
however, is but 51/4 inches, instead of 6 inches, and there are 72 suction
and 72 delivery valves for each pump. It will readily be seen that the
action of these pumps is similar to that of the bucket and plunger; each
pump having one suction and two deliveries for each revolution of the
engine. The Ontario is designed to run at a maximum speed of 33
revolutions a minute; and the service required of it is to run regularly
144 hours a week, without a stop, which is performed with the utmost
regularity.
The differential pump was invented and patented, many years since, by a
party named James Ramsden, in Pennsylvania, who designed it for an
ordinary house pump. It was subsequently reinvented by the writer, who
first ascertained that he was not the original inventor upon applying for
a patent. A pump of this description was run at the Hecla mine for
several years, at a speed of 500 feet a minute; and its performance was
in every way satisfactory.
DIRECT ACTING STEAM PUMPS.
This class of machinery deserves a prominent place, as the number in use
vastly exceeds those of all other types combined.
The first consideration will be given to the Worthington, which is the
pioneer of its type, having been invented by the late Henry R.
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