JB/106/067/001

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4o. Preservation of Uniformity & Steadiness of
Temperature

Uniformity preserved in fluids (with ye exception before mentioned)
applying heat at the top bottom & cold at the bottom top.
or else by machanical agitation.

Steadiness within a certain range by a successive gradation of
temperatures as before explained.- But this will require the perfect
steadiness of the two extreme points: with respect to of the lowermost we have
a sufficiently perfect means of obtaining it by ice. The highest
may be obtained by making the supply of heat from a lamp
for instance precisely equivalent equal to the expenditure: which might
easily be done after a few trials, were it not that the expenditure
viz(, depending of the lower temperature of the air) is variable.
this however might also be adjusted by repeated trials.

A more perfect method would be by employing a regulator
admitting hot water or air as it cooled: & letting out the as much cold water
as much colder water, or air: as by the following contrivances
Two thermometers filled with oil & rendered just boy
buoyant at 30o when immersed in water at 50o
but sinkingrising in higher heats and risingsinking in lower.
The whole quanti expansion should be made in the
descending arch.

{Plan of Contrivances showing position of 40o 50o and 60o chamber}

Air would be improper on account
of its being in bulk depending
on the pressure of the atmosphere
which is very variable.

{Sketch showing oil and water apparatus}

c, pipe for admitting
cold water or air

h, pipe for admitting
hot water or air
or an instrument on the
hydrometer principle.

{Two sketches of equipment showing position of cold and hot water inlets and valve for admitting hot water}

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Identifier: | JB/106/067/001 "JB/" can not be assigned to a declared number type with value 106.
Date_1		Marginal Summary Numbering
Box	106	Main Headings	frigidarium
Folio number	067	Info in main headings field
Image	001	Titles	preservation of uniformity & steadiness of temperature
Category	copy/fair copy sheet	Number of Pages	4
Recto/Verso	recto	Page Numbering	f4 / / /
Penner	fr4	Watermarks	pot 1796
Marginals		Paper Producer	fc6
Corrections		Paper Produced in Year	1796
Notes public	includes drawings	ID Number	34655
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