Year: 1886

page_text: Date of Application, 17th July, 1886.
Complete Left, 16th Apr., 1887.
Complete Accepted, 7th June, 1887.
I DONALD MCLACHLAN of 14 Cambridge Street Glasgow in the County of Lanark
Venetian Blind Manufacturer, do hereby declare the nature of this invention to be
as follows:-
:-
The apparatus consists of an air tight tank (hereinafter called tank A.) of any con-
venient dimensions, but the depth should be as near as possible equal to the difference
between the levels, at average high and low tide, of the tidal water in the locality
where the apparatus is to be laid down.
This tank is sunk and fixed (either above or below high water mark) in such a
position that the bottom coincides with the level of the water at low tide while the
top coincides with the level at high tide or as near thereto as convenient.
A communication between this tank and the tidal water is formed by means of a
pipe or channel (hereinafter called pipe a.) leading from the lowest part of the interior
of the tank to or about low water level.
A water tight tank open at the top (hereinafter called tank B.) is placed in such a
position that it is filled at each high tide and retains the water when the tide recedes.
This tank should be as shallow as possible and should be of equal capacity with tank C.
hereinafter described.
An air tight tank hereinafter called tank C.) is placed in a position on a higher
level than tank B but the difference in level between the top of tank C. and the bottom
of tank B must be less than that between the levels of high and low tide. This tank,
like tank B, should be shallow.
A communication is formed between the tops of tanks A. and C. by a pipe (herein-
after called pipe c).
A pipe containing an upward opening valve (hereinafter called pipe c₁) is inserted
in the bottom of the tank C and dips into and reaches close to the bottom of tank B,

page_text: A tank of similar construction to tank B (hereinafter called tank D.) is placed at
the same distance above tank C, as the latter is above tank B.
A pipe (hereinafter called pipe c,) is inserted into the bottom of tank C. and
discharges into tank D. This pipe contains an upward opening valve.
The above described apparatus will raise water above high water level, to a some-
what less height than twice the difference between high and low tide. If it is desired
to increase the lift, any number of sets of tanks, similar in construction to C. and D.
can be placed at similar additional elevations with similar connections vizt.: each air
tight tank must have a communication between its top and the top of tank A. similar
to pipe c. and it must also have pipes each containing an upward opening valve,
leading from the bottom thereof to the open tanks immediately above and below it
respectively, similar to pipes c₁ and c₁. If the series of tanks are increased in
number, the capacity of each must be proportionally diminished.
The topmost tank which is always an open one, and may be made of larger
dimensions (though as shallow as possible) is used as a reservoir from which the water
may be drawn as desired.

page_text: I, DONALD MOLACHLAN of 14 Cambridge Street Glasgow in the County of Lanark
Scotland Venetian Blind Manufacturer. 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, reference being had to the annexed
Drawing:-
:-
The apparatus consists of an air tight tank A of any convenient dimensions, but the
depth should be as near as possible equal to the difference between the levels, at
average high and low tide of the tidal water in the locality where the apparatus is to
be laid down. This tank is sunk and fixed (either above or below high water mark)
in such a position that the bottom coincides with the level of the water at low tide
while the top coincides with the level at high tide or as near thereto as convenient.
A communication between this tank A and the tidal water is formed by means of a
pipe or channel 6 leading from the lowest part of the interior of the tank to or about
low water level. A water tight tank B open at the top is placed in such a position
that it is filled at each high tide and retains the water when the tide recedes, or water
other than the tidal water may be led thereinto. This tank should be as shallow as
possible and should be of equal capacity with tank C which is closed at top and air
tight and placed in a position on a higher level than tank B, but the difference in
level between the top of tank C and bottom of tank B should be less than that
between the levels of high and low tide. This tank should be shallow.
A communication is formed between the tops of tanks A and C by a pipe e.
A pipe 9 containing an upward opening valve (not shown) is inserted in bottom
of tank C and dips into and reaches close to the bottom of tank B the lower end
being open.
A tank D of similar construction to tank B is placed at the same
distance above tank C as the latter is above tank B. A pipe i is inserted into the
bottom of tank C and discharges into tank D. This pipe contains an upward opening
valve (not shown).
The apparatus operates as follows, As the tide recedes a vacuum is created in
tanks A and C which sucks the water up pipe 9 from tank B into tank C and as the
tide fills the tank A a pressure in tank A and C forcing the water up pipe i into tank D
the water being prevented from returning by the valves opening in the pipes only
upwards.
If it is desired to increase the lift, any number of sets of tanks similar in construction
to tanks C and D can be placed at similar additional elevations with similar connec-
tions viz. each air tight tank must have a communication between its top and the top of

page_text: tank A. similar to pipe e and it must also have pipes each containing an upward
opening valve leading from the bottom thereof to the open tanks immediately above
and below it respectively similar to pipes 9 and i. If the sets of tanks are increased
in number the capacity of each should be proportionally diminished.
The top tank F which is open may be made of large size though as shallow as
possible and is used as a reservoir.
Having now 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.
The arrangement and combination of apparatus substantially as and for the purpose
hereinbefore set forth and shown.