AN IMPROVEMENT IN THE CONSTRUCTION OF VESSELS OR APPARATUS EXPOSED TO CORROSIVE
Year: 1883

page_text: LETTERS PATENT to John Imray of No: 28 Southampton Buildings, Chancery
Lane in the County of Middlesex for an Invention of "AN IMPROVEMENT
IN THE CONSTRUCTION OF VESSELS OR APPARATUS EXPOSED TO CORROSIVE
"
ACTION communicated to him from abroad by Hermann Egells of Berlin
in the German Empire.
PROVISIONAL SPECIFICATION left by the said John Imray at the Office
of the Commissioners of Patents on the 28th December 1883.
JOHN IMRAY of N° 28 Southampton Buildings, Chancery Lane in the County of
Middlesex "AN IMPROVEMENT IN THE CONSTRUCTIONS OF VESSELS OR APPARATUS
EXPOSED TO CORROSIVE ACTION [communicated to him from abroad by Hermann
Egells of Berlin in the German Empire.]
"
For many chemical operations, it is necessary to use vessels or apparatus made
of lead, so as to present a metallic surface that is not readily corroded by the
substances treated, but the use of lead for this purpose occasions many difficulties
of construction, on account of the soft and yielding character of this metal. This
invention has for its object to avoid these difficulties by the use of a compound
metal of sufficient strength and stiffness to resist the strains to which the vessels
or apparatus are exposed, and yet to present a leaden surface to the chemicals
treated. For this purpose, the vessels or apparatus are made of an alloy, like type
metal, consisting chiefly of lead and antimony, to which a little copper may be
added. The surfaces that are to be exposed to the action of the chemicals are then
coated over with a thin layer of pure soft lead, fused upon them by the blowpipe,
so that there is an actual soldering of the lead to the alloy. The other surfaces of
the vessels or apparatus, if they are to be exposed to air, steam or damp, are
preferably tinned in the usual way,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Imray in the Patent Office on the 20th June 1884.
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JOHN IMRAY of N° 28 Southampton Buildings, Chancery Lane in the county of
Middlesex 'AN IMPROVEMENT IN THE CONSTRUCTION OF VESSELS OR APPARATUS
EXPOSED TO CORROSIVE ACTION "A communication to me from abroad by Hermann
Egells of Berlin in the German Empire
For many chemical operations it is necessary to use vessels or apparatus made
of lead so as to present a metallic surface that is not readily corroded by the
substances treated, but the use of lead for this purpose occasions difficulties of
construction on account of the soft and yielding character of this metal. This
invention has for its object to avoid these difficulties by the use of a compound
metal of sufficient strength and stiffness to resist the strains to which the vessels
or apparatus are exposed, and yet to present a leaden surface to the chemicals
treated. For this purpose, the vessels or apparatus are made of an alloy like type
metal; consisting chiefly of lead and antimony, to which a little copper may be
added. The surfaces that are to be exposed to the action of the chemicals are then
coated over with a thin layer of pure soft lead, fused upon them by the blowpipe,
so that there is an actual soldering of the lead to the alloy. The other surfaces of
the vessels or apparatus, if they are to be exposed to air, steam or damp, are
preferably tinned in the usual way.
Having thus described the nature of this invention and in what manner the
same is to be performed, as communicated to me by my foreign correspondent,
I claim :-
Constructing vessels or apparatus exposed to corrosive action, of hard alloy of
lead, such as type metal, having lead fused on the exposed surfaces, substantially
as and for the purpose herein set forth.
In Witness whereof, I the said John Imray have hereunto set my hand and seal
this Tenth day of June in the year of our Lord, one thousand eight hundred and
eighty-four.
TATT