Improvements in and relating to Submarine Boats.
Year: 1899

page_text: Date of Application, 18th Oct., 1899-Accepted, 18th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in and relating to Submarine Boats.
I, CHRISTIAN HORREBOW HOMAN, of No. 8, Camilla Colletts Vei, Christiania,
in the Kingdom of Norway, Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
:-
The present invention relates to an improvement in the hollow mast for sub-
marine boats patented in Great Britain No. 18938 of 1898.
The improvement consists in the arrangement that the mast is not hollow
throughout its entire length but is formed of a flat plate or other thin support
preferably pivoted to the ship's hull, which support offers as little resistance as
possible to the water whilst being raised or lowered and possesses an upper
hollow chamber for reconnoitring purposes.
In the accompanying drawing:
Figure 1 shows a submarine boat with the new reconnoitring mast.
Figure illustrates on a larger scale the entrance to the chamber also the
connection of the mast with the ship's hull.
The mast a can be raised or lowered by means of a toothed quadrant and
pinions c, d as described in the original patent or by any other suitable means.
The lower part or shaft a of the mast is constructed of a flat plate or of a sun-
port of any convenient section which affords the requisite stiffness and for the
purpose of diminishing the resistance against the water which the hollow mast
described in the original patent was found to cause to a considerable extent.
whilst it was being raised or lowered. In the upper or free end of this mast a
the reconnoitring chamber e itself is arranged. The entrance to this chamber
is through an opening in the deck of the boat so placed that it corresponds
with an opening in the reconnoitring chamber when the mast is lowered.
The mechanical means for the water tight connection between the chamber
and the hull of the boat can of course be of various kinds. Fig. 2 shews an
example of such a mechanism. in which f indicates a ring of indiarubber or
other suitable material located in a recess in the hull: g is an iron rim arranged
in the interior of the hull on which a rubber ring or the like is exposed to
compression by means of the plates and screw bolts i. The rim has an
aperture and brackets m placed underneath it which support the vertical screw
shafts n by means of which the aperture 7 can be closed water tight by means of
the closing plate o with an interposed rubber washer. The reconnoitring chamber e
has a downwardly projecting rim within the ring in the bottom of which
rim is an opening 9 which is closed watertight in a similar manner to the open-
ing by means of screw shafts and a cover plate s. In the lowered position of
the mast a watertight connection between the reconnoitring chamber and the
hull is effected by means of the rubber rings f and k partly owing to the weight
of the mast and partly in consequence of the screws i. The cover plates & and o
can then be opened by means of the screws n and r; the same plates in their
closed state effect the water tight closing of the reconnoitring chamber and
of the hull of the boat respectively when the mast is raised.