JB/106/012/003

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The fla match
can not well be
convey'd into the
flash-chamber
at any of the
mouths: it would
be wilted by water
dripping from
the upper part
of the mouth.

It must be introduced
either
laterally at an
aperture higher
situated in short
situated above the
greatest rise of
the water, or
perpendicularly
through the
middle of the
cover

Instead of a Neck
on a floor of cast
iron, just below
the lowest level of
the water in the
pond, opening by
valves in as many
places as possible.
The will save the
expence of pipes
and nothing more
will be necessary
than a square
hollow tower of the
same diameter as
the flash-chamber
all the way down.

like the fetching of ?? common pump.
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The mouth of the
flash-chamber may
occupy nearly the
whole extent of one
of the sides
of the square.

For a valve
either

1. Either a op clap-
-door of iron or
wood this cased with
thick iron sliding
up and down in
a groove -
or

2. a fixt grating
of flat bars on
the outside, and behind
it in the inside
a similar
grating to slide so
that its bars shall
alternatively fill coincide
with the bars
of the outer one, or
exactly fill up the spaces
between them

Advantages of the
1st valve

1. The discharge will
be performed in half
the time

2. There will be fewer
points of contact to
afford room for leakage.

Disadvantages.

It will require a force
immensely greater to
work it:

It must be at
least double the weight)2.

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2. It will have
perhaps 12 times
as far to move.

3. The motion .will
be upinwards -in a
direction opposite to
that of its gravity

The second valve
slides horizontally:
and it has no greater
space to move over
than the distance between
bar and bar
of the fixt grating:
say 3 inches.

The touching surfaces
must be
kept well greased :
and the. substance
must be thick to prevent
warping.

{Line diagrams of design}

will not signify: since
by taking an observation
first of the heat,
and afterwards of the
degree of ascension
which is the result,
the proportion between
the one and the
other will be
nevertheless ascertained.

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The great object will be to ascerta make the expulsion of the air with a given quantity of fewe; of a given sort as great and as quick as possible: and the great point to ascertain is when a sufficient expulsion has taken place This may be done by the help of two instruments 1. An index rod the bottom stuck into a board floating in the water in the flash chamber: the upper end moving up and down freely in a gllass tube closed at -top cemented into the cover. 2. A thermometer passing through the cover in such a manner as that the whole range of expansion shall be visible above the cover & visible. N.B. Bothe ascensio-index and thermometer should be in one of the corners where thay may be at as much out of the way of the heat of the flask as possible, and be supported by rings from the wall. The thermometer will not indicate a heat nearly so great as what the air has acquired: but this will {Line diagrams of devices described}

Identifier: | JB/106/012/003"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	003	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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