IMPROVED ARRANGEMENTS AND APPARATUS FOR REMOVING OR TRANSFERRING TAR OR SIMILAR MATERIALS FROM ONE PLACE. OR RECEPTACLE TO ANOTHER
Year: 1866

page_text: PROVISIONAL SPECIFICATION left by Edward Dorsett at the Office of
the Commissioners of Patents, with his Petition, on the 20th December
1866.
I, EDWARD DORSETT, of the City of London, do hereby declare the nature
of the said Invention for "IMPROVED ARRANGEMENTS AND APPARATUS FOR
REMOVING OR TRANSFERRING TAR OR SIMILAR MATERIALS FROM ONE PLACE. OR
RECEPTACLE TO ANOTHER," to be as follows:-
The object of the. Invention is the removal or transfer of tar or similar
materials from one place to another in a more systematic and economical
manner. than at present adopted, and is intended especially for discharging
tar from barges direct into receivers or boilers instead of pumping out the tar
by the ordinary pumps, so that it may be conveyed any distance through pipes
without having to pass through the working parts of the pumps as is at present
the case. Between the barge or receptacle containing the tar and the receiver
into which it is intended to be transferred I employ an air-tight vessel, into
which the tar is drawn through pipes from the barge or receptacle, and out
of which the tar is forced through pipes direct to where it is to be transferred,
and in connection with the said air-tight vessel I employ an improved air pump
so constructed that it will either pump air into or out of the air-tight vessel as
required. The air pump consists of a cylinder closed at both ends with a
piston working in it, and having two chambers on the outside, each chamber
terminating at each end in a valve box, the valves being so arranged that the
two belonging to one chamber, one at each end of the cylinder, will only allow

page_text: air to pass into the cylinder, the air having first to pass through the chamber
communicating with them, while the two valves belonging to the other chamber,
that is, one at each end of the cylinder, will only allow of air passing out of
the cylinder, and then through the chamber communicating with them.
Communicating_with_each_of_the said chambers are two pipes, one from
each chamber, being connected with the said air-tight vessel, and one from
each chamber communicating with the atmosphere. Each of these pipes
is provided with a tap so that it can be shut off at pleasure. When it is
desired to fill the said air-tight vessel with the tar the pipe between the vessel
and the chamber of the air pump communicating with the outlet valves and the
atmosphere are turned on, as is also the pipe between the barge required to
be emptied, and the said air-tight vessel; the pump being now worked, the
only air that can get into the cylinder must come out of the air-tight vessel,
which air after entering the cylinder is expelled into the atmosphere. This
operation of pumping being continued until the requisite vacuum has been
obtained it will cause the tar from the barge to pass through the intervening
pipe and discharge itself into the said air-tight vessel. As soon as the said
vessel is filled the two pipes of the air pump now open are closed, as is also
that between the barge and the air-tight vessel, and the other two pipes of
the air pump, namely, that between the air-tight vessel and the chamber of
the air pump communicating with the outlet valves, and the pipe communi-
cating with the atmosphere and the inlet valves are opened, as is also that pipe
between the said air-tight vessel and the reservoir into which the tar has to be.
deposited. The only air that can now get into the cylinder is through the
pipe communicating with the atmosphere, while the air after entering the
cylinder must get out through the pipe communicating with the air-tight
receiver; thus if the pump be now worked it will force air into the air-tight
vessel, and thus force the tar out, which can be conducted by pipes to any
required place.