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The higher the
line from whence
the water falls,
the greater the
momentum acquired
by means
of a given quantity
of water.
The utmosttotal height
to which water is
capable to be pre
raised by the pressure
of the atmosphere
is never
less than 33 foot
Suppose each
1. Each flash
exprells out half
the air
2. Three foot is
the rise required
to be given by
each stroke
Let them
1. The cover be
33 high from the
surface of the water
in the pond
2. The lowest line
of the discharging
mouth or mouths
27 foot
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Thence the water
being already at
27 a flash will
raise it to 30
foot, and so toties
quoties.
N.B. It may be
easily drawn up
to that height &
kept there, by the
means that will
be mentioned presently.
Drawing the water
up to this height
before the machine
begins to work has
two good effects
1. It makes the
fall be from the
greatest height
possible.
2. By lessening
the height and
consequentlythence the
bulk of the flash
-chamber, it makes)
a given quantity
- of fuel go so
much the farther.
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Six foot being
the height of
the flash-chamber,
divide it
thus
Under the
Match-Cage 2
Height of the
Match & 2
its Cage
Above the
Match-Cage 2
—
6
Underneath
Between the bottom
of the body or
flash-chamber
are the Neck or
Necks
This or these
must be exactly
closed by a valve
or valves opening
inwards
Each time of
workig the pump
requires three different
successive operations,
which can not be
performe going
on at the same
time.
1. Introducing the
burning match into the
fire-chamber.
2. When the requisite
quantity of
air has been thus
expelled, closing
the fire-chamber that
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the water may rise up from the surface of the pond through the necks by forcing open the valves. 3. Opening the mouths of the pump, that the water gained as above may discharge itself and a supply of fresh air equal in bulk be taken in in consequence. If these three operations took up each the same quantity of time, and so that the replenishment went on as quick as the discharging, and if the aperture made for the discharge were equal to the aperture made for the admission of the water; viz. the sum of the orifices of the mouths equal to the sum of the orifices of the necks at the valves, then to keep up a constant stream
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stream raining discharging down itself from the ?? reservoir into which the pumpdischarged itself would require that the sum of the orifices at the valves should be three times the sum of the ooorifices at the mouths, But the time of replenishment that is of the rise whatever were the width of the necks would certainly be much longer than that of the discharge, that is of the fall. Upon opening the Mouths the water will continue to run out, (unless they are first shut) till it it comes to the lowest line of the mouths: and it can not run lower being stopt from runningback again in the inside by the valves. When once therefore it has been raised to this level it will will cont never sink any lower, but continue at that level of course: and to raise it to that level will require only preparataors two or three flashes extra at the beginning of the operation,
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Identifier: | JB/106/012/002"JB/" can not be assigned to a declared number type with value 106. |
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106 |
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012 |
flash-pump |
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002 |
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text sheet |
2 |
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|
recto |
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|
jeremy bentham |
[[watermarks::l munn [britannia emblem]]] |
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benjamin constant |
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includes drawings |
34600 |
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