IMPROVEMENTS IN APPLIANCES FOR PROTECTING CHIMNEYS OR FUNNELS OF SHIPS OF WAR AGAINST SHOT
Year: 1882

page_text: LETTERS PATENT to Peter Jensen of 33 Chancery Lane in the County of
Middlesex for an Invention of "IMPROVEMENTS IN APPLIANCES FOR PROTECTING
CHIMNEYS OR FUNNELS OF SHIPS OF WAR AGAINST SHOT" Communicated to
him from abroad by Heinrich von Stockhausen of Dresden Germany
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the Office
of the Commissioners of Patents on the 2nd December 1882.
PETER JENSEN of 33 Chancery Lane in the County of Middlesex "IMPROVEMENTS
IN APPLIANCES FOR PROTECTING CHIMNEYS OR FUNNELS OF SHIPS OF WAR AGAINST
SHOT" (A Communication to me from abroad by Heinrich von Stockhausen of
Dresden Germany)
In armoured ships of war the place where the funnel passes through the deck
has hitherto scarcely or at all been protected. The bulwarks afford some protection
against direct shots but not against parabolic shooting or against shot from places
above the bulwarks. The necessity for a protection of this part appears to arise
from the repeated cases of ships going to the bottom from shots hitting this part.
The object of this invention is to render this vulnerable part proof against
projectiles. For this purpose the continuity of the funnel where it passes through
the deck is interrupted and a dome armour is provided baving a suitable passage
or passages for the smoke so that the boiler draught is not in anywise checked or
interrupted while at the same time projectiles are prevented from entering the
boiler or space below deck at this place.
The lower part of the chimney may either terminate just above the deck or it
may at this place be widened out bellmouth shape. In either case a dome or
bell armour is placed over the chimney at this place to protect it. On this armour
is placed the upper part of the chimney.
In order to connect the interrupted draught passage a number of tubes may be
passed through the side of the dome and entering the upper part of the chimney
in an upward slanting direction. By such an arrangement however the dome is

page_text: sensibly weakened while small pieces of projectiles might possibly find their way
into the boiler or down to the stoke hole; to prevent this a stout armour ring is
provided round the exit end of the lower part of the chimney and connected with
the dome by an angle ring.
Or according to a modified arrangement where the chimney is also in two parts
and the lower part covered by a dome armour this latter is formed with a series
of slanting apertures which terminate in a space formed between the said dome and
another upper dome on which the upper part of the chimney is mounted and
which is strengthened at its lower part by an outer angle ring which connects it
to the deck. The inner or lower dome is strengthened in the vertical direction
against shells by a rib underneath.
Or according to another modified arrangement the lower dome armour is made
with a lower rib as above but without any through apertures and the smoke and
gases from the boiler pass all round the edge of it and into the annular passage
between it and the upper dome; the lower dome is formed with feet or brackets
which support it in a conical recess in the deck. The outer dome is formed with a
stout bottom flange. To guide the smoke and gases properly the lower dome is
formed with a downward projecting part spherical plate or bell.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Peter Jensen in the Great Seal Patent Office on the 2nd June
1883.
PETER JENSEN of 33 Chancery Lane in the County of Middlesex "IMPROVEMENTS
IN APPLIANCES FOR PROTECTING CHIMNEYS OR FUNNELS OF SHIPS OF WAR AGAINST
SHOT (A Communication to me from abroad by Friedrich [sic] von Stockhausen
of Dresden Germany)
"
In armoured ships of war the place where the funnel passes through the deck
has hitherto scarcely or at all been protected. The bulwarks afford some protection
against direct shots but not against parabolic shooting or against shot from places
above the bulwarks. The necessity for a protection of this part appears to arise
from the repeated cases of ships going to the bottom from shots hitting this part.
The object of this invention is to render this vulnerable part proof against
projectiles. For this purpose the continuity of the funnel where it passes through
the deck is interrupted and a dome armour is provided having a suitable passage
or passages for the smoke so that the boiler-draught is not in any wise checked
or interrupted while at the same time projectiles are prevented from entering the
boiler or space below deck at this place.
Fig 1 is half elevation and half vertical section of one such arrangement;
Fig 2 is vertical section and Fig 3 plan section of another arrangement, and Fig 4
a vertical section of a slight modification of the last named arrangement.
The lower part of the chimney may either as shown in Figure 1, terminate just
above the deck or as shown in Figs 2, 3 and 4 it may at this place be widened out
bell-mouth shape. In either case a dome or bell armour B is placed over the
chimney at this place to protect it. On this armour B is placed the upper part A
of the chimney.
In order to connect the interrupted draught passage a number of tubes F may
as shown at Fig 1 be passed through the sides of the dome and entering the upper
part A of the chimney in an upward slanting direction. The arrows indicate the
direction of the smoke. By such an arrangement however the dome is sensibly
weakened while small pieces of projectiles might possibly find their way into the
boiler or down to the stoke hole; to prevent this a stout armour ring E is pro-
vided round the exit end of the lower part of the chimney and connected with the
dome by an angle ring a.
Or according to a modified arrangement shown in vertical section at Fig 2 and
in plan section at Fig 3 where the chimney is also in two parts and the lower part
covered by a dome armour B this latter is formed with a series of slanting
apertures b which terminate in a space formed between the said dome and another
upper dome D on which the upper part of the chimney is mounted and which is
strengthened at its lower part by an outer angle ring D¹ which connects it to the
deck. The inner or lower dome B is strengthened in the vertical direction against
shells by a rib underneath.
Or according to another modified arrangement shown at Fig 4, the lower dome
armour B is made with a lower rib as above but without any through apertures
and the smoke and gases from the boiler pass all round the edge of it and into the
annular passage between it and the upper dome D; the lower dome is formed
with feet or brackets which support it in a conical recess in the deck. The outer
dome D is formed with a stout bottom flange. To guide the smoke and gases
properly the lower dome B is formed with a downward projecting part spherical
plate or bell G.
The above illustrated forms are examples only as the construction may be
varied considerably.

page_text: And having thus described and ascertained the nature of this invention and the
manner of carrying the same into effect as communicated to me I declare that I
claim :-
1. A funnel shield or means of protection for the funnels of war ships for the
purpose of shielding the boiler against shot having the following essential points
viz that the funnel at the level of the deck is divided into two parts, and that in
the gap thereby produced, a dome armour such for instance as B is placed, and
the smoke or furnace gases go through openings b, b under a second strong dome
armour, which guides the furnace gases to the upper part of the funnel, and protects
the openings b, b against projectiles substantially as described with reference to
Figs 2 and 3.
2. In the aforesaid funnel shield, dome armour B with pipes F for carrying
away the furnace gases from the dome B to the funnel substantially as described
with reference to Fig 1.
3. In combination with the chimney A the deck C and the dome armour B,
a shield or ring E which prevents the entrance of fragments of shot into the boiler
substantially as described with reference to Fig 1.
4. In the aforesaid funnel shield, the arranging the exit of the smoke pipes at
the level of the deck in combination with a dome armour B which may be
strengthened by ribs and with a second dome armour D and guiding dome G in
such a manner that the furnace gases go through the space formed between the two
domes to the upper funnel substantially as described with reference to Fig 4.
In witness whereof I the said Peter Jensen have hereunto set my hand and
seal this First day of June in the year of our Lord One thousand eight
hundred and eightythree :-