Year: 1888

page_text: Date of Application, 13th Feb., 1888
Complete Specification Left, 2nd July,
1888
Complete Specification Accepted, 12th Feb., 18
at a Constant Depth below the Surface of the Water.
I, The Honble. STEPHEN COLERIDGE of 7 Egerton Mansions, South Kensington,
private Secretary to the Lord Chief Justice of England, and barrister at law, do
hereby declare the nature of this invention to be as follows:-
7
An air tight chamber into which is fitted a cylinder and piston-or cylinders and.
pistons.
The piston rod as it oscillates in and out revolves a small wheel (to which it is
connected by cogs or otherwise) this way and that.
The small wheel is rigidly connected on a common axle to a larger wheel around
the circumference of which runs the chain attached to the torpedo, which is
buoyant.
:
The whole contrivance is fastened to the bottom of the sea at low tide, the air
chamber, with the piston at the end of its outward thrust, haying previously been
filled with air or other elastic gas or substance, at a pressure equal to that exercised
by the water two feet from the bottom at low tide.
In accordance with what is known as "Boyle's Law" viz. that with gases the
volume varies inversely as the pressure, the volume of the air in the air chamber
will diminish inversely as the pressure increases from the greater depth. of water (as
the tide rises).
As the tide rises and falls the piston will therefore oscillate in the cylinder and its
motion multiplied upon the larger wheel will let up and draw down again the
torpedo which will always remain approximately at the same distance from the.
surface.
The novelty of this invention consists in utilizing the changes of pressure near the
sea bottom (or at any fixed distance from the bottom) from the rise and fall of tides
upon any elastic substance for the purpose of thereby producing the oscillation of a
piston, which oscillation after multiplication by wheels or otherwise can be used to let
up and down a buoyant torpedo or buoy so that it shall always remain approximately
at the same distance from the surface.
Tad this 19th
Wah... 1000

page_text: at a Constant Depth below the Surface of the Water.
The Honble. STEPHEN COLERIDGE, M.A. private Secretary to the Lord Chief
Justice of England of 7 Egerton Mansions, South Kensington, S.W. 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 accompanying drawings I-illustrate the invention for a fifteen foot tide―They
are to scale-The apparatus is moored and strained so that the level of the piston B
at low tide is 35 feet from the surface of the water.
When lowered to its mooring the air chamber A' A' must be filled with air at a
pressure equal to that exercised by the water per square inch at the depth of 1
35 feet.
In the example given the cubic contents of the entire air chamber A' A' at low
tide is 104 cubic feet (this is allowing 3 cubic feet for the axle passago J, piston rod
passage K and stays).
Taking the water at 63 lbs. per cubic foot and the atmosphere at 2160 lbs. per
superficial foot, the pressure on the piston B whose area is 6 square feet, at low
tide is :-

page_text: many mines. The drawings are to scale and explain themselves-The mine at low
tide, as will be seen, has a maximum possible linear oscillation about a circle three
feet in diameter.
The constant vertical depth of the mine from the surface is subject to no variation
except one caused by differences of barometric pressure of the atmosphere on the
surface of the water.
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 :-
1. With an air chamber moored to the ground under water at a fixed distance from
the bottom, the application of Boyle's Law so that the difference of pressure exercised
at high and low tide on the air chamber shall work a mine or other body up and down
so that its distance from the surface remains constant.