IMPROVEMENTS IN APPLYING ZING FOR PREVENTING CORROSION IN STEAM BOILERS
Year: 1882

page_text: LETTERS PATENT to James Ballantyne Hannay, of Glasgow, in the County of
Lanark, North Britain, Chemist for an Invention of "IMPROVEMENTS IN
APPLYING ZING FOR PREVENTING CORROSION IN STEAM BOILERS
"
PROVISIONAL SPECIFICATION left by the said James Ballantyne Hannay
. at the Office of the Commissioners of Patents on the 9th December 1882.
JAMES BALLANTYNE HANNAY, of Glasgow, in the County of Lanark, North
Britain, Chemist, "IMPROVEMENTS IN APPLYING ZINC FOR PREVENTING CORROSION
IN STEAM BOILERS
"
This Invention comprises further improvements upon the Invention for which
Letters Patent were granted to the present applicant and dated 11 June 1881
(No 2544)
By the present Invention the zinc masses of spherical, or speroidal, or poly-
hedral, or cubical form, or other form having small difference of thickness in different
directions, are rendered more durable and efficient by being brought into the
condition known as malleable instead of being used in the condition they have
when simply cast. For this purpose the masses are hammered or forcibly pressed
or rolled the operation being by preference effected suddenly. Thus a convenient
and satisfactory means for the purpose consists of a powerful screw press fitted
with a heavy fly wheel or heavily weighted arms and provided with suitably
shaped dies. By a further improvement the zinc is made. more susceptible of being
rendered malleable by being alloyed with a small portion, say not more than
10 per centum of lead, tin, or copper.
Another improvement consists in carrying each of the zinc masses in the boiler
in an iron ladle of suitable size such ladle being clamped to some of the tubes or
fixed inside the boiler in any convenient way and not requiring to be removed
when supplying new blocks or balls of zinc as such blocks or balls have simply to
be placed in the ladles after these have been cleared out.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Ballantyne Hannay in the Great Seal Patent Office on the
7th June 1883.
JAMES BALLANTYNE HANNAY, of Glasgow, in the County of Lanark, North
Britain, Chemist "IMPROVEMENTS IN APPLYING ZINC FOR PREVENTING CORROSION.
IN STEAM-BOILERS"
My said Invention comprises further improvements upon the Invention for which
Letters Patent were granted to me and dated 11 June 1881 (No 2544)
By my present Invention the zinc masses of spherical, or spheroidal, or poly-
bedral, or cubical form, or other form having small difference of thickness in
different directions, are rendered more durable and efficient by being brought into
the condition known as malleable, instead of being used in the condition they have
when simply cast. For this purpose the masses are hammered or forcibly pressed
or rolled, the operation being by preference effected suddenly. Thus a convenient
and satisfactory means for the purpose consists of a powerful screw. press fitted
with a heavy fly wheel or heavily weighted arms and provided with suitably
shaped dies. By a further improvement the zinc is made more susceptible of
being rendered malleable by being alloyed with a small portion, say not more than
10 per centum of lead, tin, or copper.
"
Another improvement consists in carrying each of the zinc masses in the boiler
in an iron ladle of suitable size such ladle being clamped to some of the tubes or
fixed inside the boiler in any convenient way and not requiring to be removed
when supplying new blocks or balls of zinc as such blocks or balls have simply to
be placed in the ladles after these have been cleared out.
Having thus particularly described my said Invention and the manner of
performing the same I have to state that I do not restrict myself to the precise
details hereinbefore described but that what I believe to be novel and original and
claim as the Invention secured to me by and in terms of the hereinbefore in part
recited Letters Patent is:-
1. The use of zinc blocks or masses of a spherical, or spheroidal, or polyhedral or
cubical or other similar form for preventing corrosion in steam boilers such blocks
or masses having been subjected to compression after having been cast substantially
in the manner and for the purpose hereinbefore described.
2. The forming of the blocks or masses of zinc alloyed with 10 per centum or
less of lead, tin or copper and subjected to compression after having been cast
substantially as herein before described.
In Witness whereof I, the said James Ballantyne Hannay, have hereunto set
my hand and seal this sixth day of June in the year of our Lord One
thousand eight hundred and eighty-three.
Witness
EDMUND HUNT
Patent Agent
Glasgow.
JB HANNAY (L.S.)