AN IMPROVEMENT IN APPARATUS FOR INDICATING THE TRIM OF SHIPS
Year: 1885

page_text: I EDWARD LYON BERTHON of "The Vicarage," Romsey, Hants, Master of Arts,
do hereby declare the nature of my said invention for "AN IMPROVEMENT IN
APPARATUS FOR INDICATING THE TRIM OF SHIPS," to be as follows:-
This invention relates to a certain detail improvement on, and addition to, the
apparatus for the purpose above mentioned as described in the specification of
a patent granted to me on the 19th December 1849 N° 12901 and consists
essentially in fitting to the vertical tubes a connecting tube so arranged that the
rise of the liquid in one tube may force the air through to the other vertical tube
or to the other bulb and equilibriate the air pressure in the two tubes and allow the
fluid to rise and fall freely according to the trim of the vessel one tube baving
preferably a coloured liquid of light specific gravity the rise and fall of which can
be read from a scale or index. The additional tube may be connected in any
desired manner by india rubber or other connections so as to prevent evaporation
of the liquid when the ship is in warm latitudes or be otherwise affected from
change of climate.

page_text: An Improvement in Apparatus for Indicating the Trim
of Ships.
I EDWARD LYON BERTHON of "The Vicarage," Romsey, Hants, Master of Arts
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:-
This invention relates to a certain detail improvement on and addition to the
apparatus for the purpose above mentioned as described in the specification of a
patent granted to me on the 19th December 1849 N° 12901 and consists essentially
in fitting to the vertical tubes a connecting tube so arranged that the rise of the
liquid in one tube may force the air through to the other vertical tube or to the
other bulb and equilibriate the air pressure in the two tubes and allow the fluid to
rise and fall freely according to the trim of the vessel one tube having preferably
a coloured liquid of light specific gravity, the rise and fall of which can be read
from a scale or index.
The additional tube may be connected in any desired manner by india rubber or
other connections so as to prevent evaporation of the liquid when the ship is in
warm latitudes or be otherwise affected from change of climate.
The annexed drawings clearly show the improvement which consists in fitting
to the bulb D an extension tube d to about the same height as the tube d leading
from the bulb D¹ and connecting the tubes d, d¹, by a tube c, the ends f, f, of which
(preferably bent) are loosely attached by india rubber ferrules g, g, to the upper
ends of the tubes d, d so that the passage between the bulbs is continuous for the
passage of air according to the displacement of mercury in the bulbs D, D¹ and
tube F.
Instead of the tubes which from the drawing may be of glass or other rigid
material it may be india rubber or flexible and with its ends arranged to fit over
the vertical tubes d, d'.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
In an apparatus of the kind described for indicating the trim of ships, con-
necting the tubes & and d by the tube e as and for the purpose set forth.