AN IMPROVED BAG FOR CONTAINING GUANO, PHOSPHATES, AND ORES
Year: 1872

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine,
Lake, & Co., Patent Agents, Southampton Buildings, London, for
the Invention of "AN IMPROVED BAG FOR CONTAINING GUANO, PHOSPHATES,
AND ORES."-A. Communication from abroad by Benjamin Rowland
Croasdale, of Philadelphia, Pennsylvania, United States of
America.
COMPLETE SPECIFICATION filed by the said William Robert Lake
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 17th January 1872, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, send greeting.
WHEREAS I am in possession of an Invention for "AN IMPROVED
BAG FOR CONTAINING GUANO, PHOSPHATES, AND ORES," and have petitioned
Her Majesty to grant unto me, my executors, administrators, and

page_text: assigns, Her Royal Letters Patent for the same, and have made solemn
Declaration that it has been communicated to me from abroad by
Benjamin Rowland Croasdale, of Philadelphia, Pennsylvania, United
States of America.
NOW KNOW YE, that I, the said William Robert Lake, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention,
and in what manner the same is to be performed, in and by the following
statement:-
-
The acids contained in guano and phosphates, and the sulphur
contained in some ores very soon weaken and rot bags formed of the
ordinary textile fabrics, and when the substances named are packed and
transported in such bags there is considerable loss from the breaking of
the bags and the wasting and spilling of their contents, and owing to
the porous open nature of such bags there is loss by evaporation of the
ammonia of guanos, and by siftage of the ores.
This Invention consists in a bag made of a textile fabric so prepared
that it is not attacked by the acids contained in guanos and phosphates,
or worn out by the attrition of the fragments of ore. Therefore much
of the loss from evaporation of the ammonia of guanos, and much, if
not all, siftage of the guanos, phosphates, ores, or other substances
contained in the bags is obviated.
In the preparation of the fabrics of which the bags are made I
proceed as follows, that is to say :-I take a roll of burlap, canvass,
cotton, or other textile fabric, and another roll of paper felt or roofing
paper, either plain or saturated with a water or an acid proof substance,
such, for instance, as coal tar. The two rolls are so placed that the felt
having received a coating of an adhesive substance can be conveniently
brought in contact with the textile fabric, and the two united by
pressure. I pour on the felt as it is drawn from its roller a quantity of
some adhesive substance that will retain its elasticity, and for this
purpose I have obtained good results from a mixture composed of about
six parts by weight of crude turpentine, four parts by weight of rosin,
two parts by weight of glue, four parts by weight of molasses, six parts
by weight of water, and one part by weight of tallow. The felt is then
immediately passed under a knife or scraper, having a serrated or
scalloped edge, the serrations or scallops being from 1 to 16 of an

page_text: inch in depth, and about ¼ of an inch apart.
By this means the
adhesive substance is distributed evenly over the felt, and scored in
ridges or furrowed. The canvass, burlap, cotton, or other textile fabric,
from its roller is then led on to the coated felt, and the two are at once
passed together between pressing rollers. If the paper felt or roofing
paper employed is not saturated with coal tar or other water or acid
proof substance before its application to the textile fabric, then a water
or acid proof coating should be applied to the outside of the felt.
It is desirable in all cases, but not really necessary, that the united
felt and fabric should be passed through a waterproof mixture such as
melted or dissolved rosin with tallow or oil warm, and then run between
pressing rollers. If desirable a second layer of the paper felt or roofing
paper, either plain or saturated, as above mentioned, can be laid on the
top of the first applied felt coating, proceeding in the same manner as
above described.
Having thus fully described the said Invention as communicated to
me by my foreign correspondent, and the manner in which it is to be
performed, I claim, a bag formed of burlap, canvass, cotton, or other
textile fabric, coated with paper felt or roofing paper (plain or saturated
with an acid or waterproof substance) in one or two layers for use in the
transportation of guanos, phosphates, and ores, substantially as set
forth.
In witness whereof, I, the said William Robert Lake, have
hereunto set my hand and seal, this Seventeenth day of January,
in the year of our Lord One thousand eight hundred and seventy-
Witness,
W. J. LOWE.
W*. ROBT. LAKE. (L.S.)