JB/106/012/002

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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 utmost total 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
expells out half
the air

2. Three foot is
the rise required
to be given by
each stroke

Let then
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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Then 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
consequently thence 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
working 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 pon reservoir into
which the pump discharged
itself would
require that the sum
of the orifices at the
valves should be
three times the sum
of the orifices 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 running back
again in the inside
by the valves.

When once therefore
it has been raised
to this level it will will
conti never sink
any lower, but continue
at that level
of course: and to raise
it to that level will require
only two or three preparatory
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.
Date_1		Marginal Summary Numbering
Box	106	Main Headings
Folio number	012	Info in main headings field	flash-pump
Image	002	Titles
Category	text sheet	Number of Pages	2
Recto/Verso	recto	Page Numbering
Penner	jeremy bentham	Watermarks	[[watermarks::l munn [britannia emblem]]]
Marginals		Paper Producer	benjamin constant
Corrections		Paper Produced in Year
Notes public	includes drawings	ID Number	34600
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