JB/107/148/001

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15 Exhaustion

Thermometers for example, may be filled almost instantaneously
to as great a degree of accuracy as they usually are by any of the
customary & tedious means. For this purpose the tubes may be
placed perpendicularly in a vessel of sufficient capacity to contain
all that is simplifying in that they should be so fluid that this orifice should be applied to the fluid or the fluid to the orifice them, supporting them by means of a grating or net work, then
the chamber may be exhausted & the mercury or sprits admitted
to the vessel containing the the tubes by means of a stop cock,
so as to cover the orifices of the tubes, there being no impediment
from air contained in them the fluid will fill them instantaneously
excepting the very small portion of air & water
that an air pump is found incapable of exhausting which may
be afterward taken away by the usual means.

Mercurial thermometers, suppose by way of example may
filled by exhausting air from the tubes & then covering
their orifices in mercury before the air is admitted
to them, on the admission of the air the pressure of the
atmosphere will force the mercury into them if they be
of any shorter length than thirty inches if longer they must be
placed perpendicularly so that the fluid may fall into them.

In order to dry the tubes for thermometers the vessel containing them
may be closed air tight then heated to a degree found convenient
say 212°, exhausting the vessel as the air becomes rarified to
A notable contrivance I cannot explain it without seeing youavoid the danger of breaking it, & at last exhausting the vessel
completely, the air being heated to this degree will probably
be capable of dissolving all the water contain in the tubes
& consequently will carry it off on exhaustion. But if not found
sufficient readmit a fresh supply of cold & dry air repeating
the operation as often as necessary

these do not please me

Identifier: | JB/107/148/001 "JB/" can not be assigned to a declared number type with value 107.
Date_1		Marginal Summary Numbering
Box	107	Main Headings
Folio number	148	Info in main headings field	exhaustion
Image	001	Titles	[[titles::instructions[?]]]
Category	copy/fair copy sheet	Number of Pages	1
Recto/Verso	recto	Page Numbering	d15
Penner		Watermarks
Marginals		Paper Producer
Corrections		Paper Produced in Year
Notes public		ID Number	35139
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