JB/106/067/003

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2o. Indirect, on the Hydrometer principle 106 f.67 verso (b)
Rising in proportion as the fluid in which it is
immersed contracts & sinking as it expands.
The expansion of the glass or other materials
must be deducted as it will counteract the force
with which these motions will be be performed.

Scale marked in the Stem.

They will be less sensible and accurate than common
themometers; but vastly less expensive.

Qu - fluid? Distilled water. -oil-solution of salt?
Mercury.

Qu. would it be better to add weights to a small cap
at the top?

{Sketched drawing of contrivance}

3. Saturation - Quantity of salts dissolved by water, known by sp.c gravity
as Sulphate of soda, &c.

Quantity of water dissolved by air. Vide Dr Hutton's experimts.

Proportional quantities of acid & alkali in Carbonate of Ammonia
Vid. Davy's Exper.ts

4. Decomposition.

N.B. Thermometers placed at ye top of liq.ds ye are cooling; at ye bottom of those heating
for ye average temperature at ye middle.

Means of inspecting the thermometer: by a pane of glass opposite
to where it is placed, & a door: or by thermometers projecting.

Qu. Means of transferring the expansion:
a horizontal tube

{Sketched diagram of design showing location of water and mercury}

Register thermometer shewing
the greatest rise
by inverting it, in the direction
A B, the alcohol will return
to its place

Fig.2 shews ye greatest fall.

Fig. 3. shews both ye
greatest rise & greatest fall
depression N.B. The tubes should not be very narrow.

{Three sketches showing (1) positon of alcohol and mercury and direction of flow, (2) sketch of contrivance (3) position of alcohol, greatest rise [r] greatest fall [f] position of mercury [using archaic symbol for mercury] and position of alcohol or water reservoir}

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Identifier: | JB/106/067/003 "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	003	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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