JB/107/084/001

Click Here To Edit Caille & Bridge 23 Aug. 1795

Inquirenda

Coolness of
temperature in proportion
to height of
elevation

2

The degree of elevation
necessary
to give a given
extent of prospect

3

The degree of declivity
necessary
to carry a given
weight to a given
distance.

4

The height for looking
into
1. Ostend
2. Dunkirk
3. Cherbourg
4. Havre.

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Uses

1

E. & W. Indies
Giving a cooler
and wholesome retreat
in the worst
situations, such as
Calcutta, Bencoolen
Batavia: and thereby
preserving health, & saving the necessity of
returning to Europe
on that account

2

Probably a muchgreater
degree of coolness
might result from
a an a quasi-insulated
elevation to a given
height than from
as much an elevation
to the same
amount in the body
of the castle itself,
the castle being the
great source or at
least magazine of
heat.

On this account
a castle in Calcutta
for example may
if 1/4 of a mile
high may be as
cool a situation
as Quito, should
it be more than
a Mile for example
above the level of
the Sea

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Structure

To diminish
the power of the
wind in its tendency
to break down
the structure by
the great distances
at which they will
act from the fulcrum
off the building
considered as
a lever, make
the permanent
room not freed
but turning upon
a centre, in the
manner of a weathercock,
so as to
present as little
surface as possible
to the wind from
whatever point it
blows. For this
purpose the room
must be not
square or round
but oblong, and
perhaps brought
to an edge at
each end

To give it additional
strength
give it by way
of batiments four
opposite Russian
Rides

For this purpose
should not the pillars
be 8 instead
of 6?

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The greater the
diameter of the
imaginary cylinder
which the pillars
mark out, the
stronger will the
building be against
the wind: but
then the stays
which are to connect
and stengthen
them, being
so much the longer
will be so much
the weaker.

Could not a
Bridge of this
sort be at any
rate made much
longer than an
iron bridge could
be made of a
high arch?

Per S.B. no.

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Hanging Bridge

Make it of Cable
strained parallel in the
manner of the warp
in a loom

The smaller the
cables
The footing for
the Carriage of
passengers might
be of plank
lead fastened upon on the
bed of cables transversely
like the tambours to writing
tables.

This will be better
than hanging the
floor from the cables
in the manner of
a hanging shelf
since that would
1. require additional
hanging-cables
2. require greater
strength of flooring
3. make it necessary
to raise the
whole so much
higher, of vessels
and to pass under

The nearer to
a horizontal form
this bridge could
be made by
straining the bottom
since the pillars
or other supports
will require to
be the less elevated.
But small ones
will may be
brought

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brought to the
same degree of tension
with less force
than large ones:
therefore they ought
to be comparatively
small and many
rather than large
and few

Bridges might
be made over
water of any
depth: and, it
should seem to
a length exceeding
that of any
existing bridge
made in the common
way

What is the limit?
Could not a bridge
be thus made
over an arm of
the sea of unfathomable
depth
and say a mile
in length?
The concavity of
the bed might
be diminished
by straining above
the elevation the main lateral
cables which compose
the elevation border
of the bed two
other similar ones
pulling together
the

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upper one and
the lower one beneath
it. in
the lowest part:
by this means
the lower part
of the upperunder
cable will be
raised still more
than the lower
part of the upper
one can be depressed.

Identifier: | JB/107/084/001 "JB/" can not be assigned to a declared number type with value 107.
Date_1	1794-08-23	Marginal Summary Numbering
Box	107	Main Headings	panopticon
Folio number	084	Info in main headings field	castle & bridge
Image	001	Titles	inquirenda / uses / structure / hanging bridge
Category	rudiments sheet (brouillon)	Number of Pages	2
Recto/Verso	recto	Page Numbering
Penner	jeremy bentham	Watermarks
Marginals		Paper Producer
Corrections		Paper Produced in Year
Notes public		ID Number	35075
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