Improvements in Apparatus for Purifying Water in or for Use in Steam Boilers.
Year: 1888

page_text: Date of Application, 19th Dec., 1888
Complete Specification Left, 15th Apr.. 1889
Complete Specification Accepted, 18th May, 1889
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Purifying Water in or for Use in
Steam Boilers.
I, JOHN POLLOCK of 66 Limestone Road in the City of Belfast and County of
Antrim in Ireland Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to the purification, by chemical action, of water used in steain
Boilers and my object is to prevent the metals employed in producing such action
from becoming encrusted and thus ceasing to act.
For this purpose I introduce into the boiler or at some convenient part of the
conduit through which the supply water flows into it, a chest or chamber having
within it a bar or rod of copper to which the water has access through perforations
or orifices in the chest or chamber.
In the chest or chamber I place a number of cylinders or balls of zinc which roll
upon the bar or rod of copper and create a chemical action in the chest or chamber
whereby corrosion and the deposit of scales or coating on the boiler plates are
prevented while the friction of the cylinders or balls with the bar or rod keeps both
themselves and it clean and bright and the chemical action is maintained
continuously.
Dated this 18th day of December 1888.
HYNDMAN & DICKSON,
6, Waring Street, Belfast,
Agents for Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Purifying Water in or for Use in
Steam Boilers.
I JOHN POLLOCK of 66 Limestone Road in the City of Belfast and County of
Antrim in Ireland, Engineer do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention relates to the purification, by chemical or galvanic action, of water
used in Steam Boilers and my object is to prevent the metals employed in producing
such action from becoming encrusted and thus ceasing to act.
For this purpose I introduce into the Boiler or at some convenient and suitable
part of the conduit or feed pipe through which the supply water flows into it a chest
or chamber having within it a bar or rod of copper to which the water has access
through perforations or orifices in the walls or ends of the chest or chamber.
In the chest or chamber I place a number of cylinders or balls of zinc which roll
upon the bar or rod of copper and create a chemical or galvanic action in the
chest or chamber whereby corrosion and the deposit of the scales or coating on the
boiler plates are prevented, while the friction of the cylinder or balls with the bar or
rod or bars or rods caused by the circulation of the water and, in case of Marine
Boilers, the rolling and pitching of the Steam Vessel keeps both themselves and it or
all of them clean and bright and the chemical or galvanic action is maintained
continuously.
The bar or rod of copper is dovetailed into the bottom of the chest or chamber
and, where balls of zinc are used, the bar or rod may be hollowed or grooved so as
to form a channel for the balls to roll in, or two or more bars or rods may be similarly
introduced into the chest or chamber, but so as to project above the bottom thereof
and serve as rails for guiding the balls when in use and for preserving the connection
of the zinc with the copper in Marine Boilers during the rolling of the Steam
Vessel. I may, however, in some cases dispense with the use of the bar or rod or
bars or rods.
The cylinders or balls being in time eaten and worn away by the actions above
described and indicated may be replaced, when necessary, through a door in the end
or other convenient part of the chest or chamber.
I prefer to introduce the chest or chamber within the Boiler and may so employ
several of such chests or chambers simultaneously, or I may place some within the
Boiler and some or one as auxiliaries or an auxiliary thereto upon the conduit or feed
pipe and, where the chest or chamber is placed upon the conduit or feed pipe, I
prefer to have it at the boiler end thereof.
And in order that my said invention may be more fully understood I shall now
proceed to refer to the several drawings on the Sheet hereunto annexed, the same
letters of reference being used throughout all the figures to indicate the same or
corresponding parts of my apparatus.

page_text: Fig. I. is an elevation of a perforated chest or chamber, partly in section, shewing
the copper bar or rod and zinc balls with a flange by which the same may be attached
to a stay or hanger in the Boiler.
Fig. II. is a cross section of the same; and
Fig. III. is an elevation of a perforated door at one end of the chest or chamber
whereby the cylinders or balls are introduced.
a is the perforated chest or chamber; b, b, b are the zinc cylinders or balls; c is
the copper bar or rod; d is a perforated door and e is a flange by which the chest or
chamber, a, may be suspended in the Boiler.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The use in or connected with Steam Boilers of a perforated chest or chamber
arranged with a copper bar or rod and zinc cylinders or balls constructed and
employed substantially in the manner and for the purposes herein before described
and shewn in the drawings hereunto annexed.
2. The use in or connected with Steam Boilers of zinc cylinders or balls rolling
in a perforated chest or chamber constructed and employed substantially in the
manner and for the purposes herein before described and shewn in the drawings
hereunto annexed.
3. The use in or connected with Steam Boilers of zinc cylinders or balls rolling
upon, over or along a copper bar or rod constructed and employed substantially in
the manner and for the purposes herein before described and shewn in the drawings
hereunto annexed.
4. The combination and arrangement of parts constituting my improved feed-
water purifying apparatus constructed and employed substantially in the manner and
for the purposes hereinbefore described and illustrated by the drawings hereunto
annexed.
HYNDMAN & DICKSON,
6, Waring Street, Belfast,
Agents for Applicant.