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or else by machanical agitation.</p> | or else by machanical agitation.</p> | ||
<p>Steadiness within a certain range by a successive gradation of<lb/> | <p>Steadiness within a certain range by a successive gradation of<lb/> | ||
temperatures as before explained.- But this will require the perfect<lb/> | |||
steadiness of the two extreme | steadiness of the two extreme points: <add>with respect to</add> <del>of</del> the lowermost we have<lb/> | ||
a sufficiently perfect means of obtaining it by ice. The highest<lb/> | a sufficiently perfect means of obtaining it by ice. The highest<lb/> | ||
may be obtained by making the supply of heat from a lamp<lb/> | may be obtained by making the supply of heat from a lamp<lb/> | ||
for instance precisely <del>equivalent</del><add>equal</add> to the | for instance precisely <del>equivalent</del><add>equal</add> to the expenditure: which might<lb/> | ||
easily be done after a few trials, were it not that the | easily be done after a few trials, were it not that the expenditure<lb/> | ||
<del>viz,</del> | <del>viz(,</del> depending of the lower temperature of the air) is variable.<lb/> | ||
this however might also be adjusted by repeated trials.</p> | this however might also be adjusted by repeated trials.</p> | ||
<p>A more perfect method would be by employing a regulator<lb/> | <p>A more perfect method would be by employing a regulator<lb/> | ||
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The whole <del>quanti</del> expansion should be made in the<lb/> | The whole <del>quanti</del> expansion should be made in the<lb/> | ||
descending arch.</p> | descending arch.</p> | ||
<p>{Plan of | <p>{Plan of Contrivances showing position of 40<hi rend="superscript">o</hi> 50<hi rend="superscript">o</hi> and 60<hi rend="superscript">o</hi> chamber}</p> | ||
<p>Air would be improper on account<lb/> | <p>Air would be improper on account<lb/> | ||
of its <del>being in</del> bulk depending<lb/> | of its <del>being in</del> bulk depending<lb/> | ||
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cold water or air</p> | cold water or air</p> | ||
<p>h, pipe for admitting<lb/> | <p>h, pipe for admitting<lb/> | ||
hot water or air | hot water or air<lb/> | ||
or an instrument on the<lb/> | or an instrument on the<lb/> | ||
hydrometer principle.</p> | hydrometer principle.</p> | ||
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|4
4o. Preservation of Uniformity & Steadiness of
Temperature
Uniformity preserved in fluids (with exception before mentioned)
applying heat at the topbottom & 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 equivalentequal 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 theas 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. |
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106 |
frigidarium |
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067 |
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001 |
preservation of uniformity & steadiness of temperature |
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copy/fair copy sheet |
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recto |
f4 / / / |
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fr4 |
pot 1796 |
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fc6 |
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1796 |
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includes drawings |
34655 |
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