IMPROVEMENTS IN THE MANUFACTURE OF FOG SIGNALS
Year: 1874

page_text: LETTERS PATENT to Edward Jones, of Birmingham, in the County
of Warwick, Engineer, for the Invention of "IMPROVEMENTS IN THE
MANUFACTURE OF FOG SIGNALS."
Sealed the 1st December 1874, and dated the 11th September 1874.
PROVISIONAL SPECIFICATION left by the said Edward Jones at the
Offfee of the Commissioners of Patents, with his Petition, on the
11th September 1874.
I, EDWARD JONES, of Birmingham, in the County of Warwick,
Engineer, do hereby declare the nature of the said Invention for "Im-
PROVEMENTS IN THE MANUFACTURE OF FOG SIGNALS," to be as follows:-
The object of my Invention of improvements in the manufacture of
fog signals is to render these articles impervious to water, as should
water penetrate to the interior of the case containing the powder, and
thereby damp the latter, the signal will probably fail to explode when
required.

page_text: will exclude water so long as such composition remains uninjured, but
should the varnish or other protecting composition be chipped off or
abraded by rough usage thero is danger of water entering the joints of
the metal case, and thereby damping the powder.
In carrying out my Invention I form the case of sheet metal in the
ordinary way, and having placed the detonating composition or per-
cussion caps and the exploding charge in the case I cover up the same
with a dished or convex lid, which is securely held in place by "up-
setting" and forcing down the edges of the outer case so as to make
these edges lap over and fit tightly down on the convex lid. Before
thus closing the case I lay round the corner or angle formed by the sides
of the case with the convex lid a streak of red lead or other paint, or
marine glue or other waterproof composition, and when the sides of the
case are forced down by means of the closing tool so as to close the
case the waterproof composition will form a packed joint which will be
quite impervious to water.
Another mode of rendering the case impermeable to water is to place
at the bottom of the outer case a ring of vulcanized india-rubber or
other analogous elastic substance or compound. The inner case to hold
the powder and detonating compound rests on this elastic ring as a bed,
and the convex dome or cover is placed over it; then upon upsetting or
closing down the vertical edges of the outer case the convex dome and
inner case will be forced down on to the clastic ring, and will thus form
a perfectly water-tight joint.
SPECIFICATION in pursuance of the conditions of the Letters Patent 2
filed by the said Edward Jones in the Great Seal Patent Office
on the 11th March 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
JONES, of Birmingham, in the County of Warwick, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of September, in the
year of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-

page_text: cessors, give and grant unto me, the said Edward Jones, Her special
licence that I, the said Edward Jones, my executors, administrators,
and assigns, or such others as I, the said Edward Jones, my executors;
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland; "the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS. IN
THE MANUFACTURE OF FOG SIGNALS," upon the condition (amongst others)
that I, the said Edward Jones, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
çause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Edward Jones, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, reference being had to the Drawing hereunto
annexed, and to the letters and figures marked thereon (that is to.
say) :—
The object of my Invention of improvements in the manufacture of
fog signals is to render these articles impervious to water, as should
water penetrate to-the-interior of the case containing the powder, and
thereby damp the latter, the signal will probably fail to explode when
required..
In order to render fog signals waterproof they are usually varnished
over externally or coated with some waterproof composition, which will
exclude water so long as such composition remains uninjured, but should
the varnish or other protecting composition be chipped off or abraded
by rough usage there is danger of water entering the joints. of the metal
case, and thereby damping the powder.
In the accompanying Drawings I have shewn two different plans of
effecting the object of my Invention.
In one arrangement I form the case a of sheet metal in the ordinary
way, as shewn in plan at Fig. 1, and having placed the detonatine

page_text: composition or percussion caps and the exploding charge in the case a
I cover up the same with a dished or convex lid b, as shewn in the
sectional view, Fig. 2. This convex lid b, which is shewn in plan and
elevation at Figures 3 and 4, is securely held in place by "upsetting"
and forcing down the edges of the outer case c, shewn in section at
Fig. 5 and in plan at Fig. 6. By upsetting the edges of the cover c
these edges are made to lap over and fit tightly down on the convex
lid b, as seen at Fig. 2. Before thus closing the outer case I lay round
the corner or angle formed by the sides of the outer case c with the
convex lid b a streak of red lead or other paint, or marine glue or other
waterproof composition, as indicated by red color in Fig. 2 and in the
plan view, Fig. 7, in which the cover 6 is removed, and when the sides
of the outer case c are forced down by means of the closing tool so as to
close the case the waterproof composition will form a packed joint,
which will be quite impervious to water.
At Figures 8 and 9 I have shewn another mode of rendering the inner
case a impermeable to water. This is effected by placing at the bottom
of the outer case c a ring of vulcanized india-rubber or other analogous
substance or compound d, as shewn in the Figures. The inner case a
which holds the powder and detonating compound rests on the elastic
ring d as a bed, and the convex dome or cover 6 is placed over it; then
upon upsetting or closing down the vertical edges of the outer case c
the convex dome 6 and inner case will be forced down on to the elastic
ring d, and will thus form a perfectly water-tight joint.
Having now described my Invention of "Improvements in Fog
Signals," and having explained the manner of carrying the same into
effect, I claim as the Invention secured to me by Letters Patent as
aforesaid, rendering the cases of fog signals impervious to water or
damp, substantially in the manner or manners herein set forth.
In witness whereof, I, the said Edward Jones, have hereunto set
my hand and seal, the Eighth day of March, in the year of our
Lord One thousand eight hundred and seventy-five.