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TRAS 15
Tuesday Jan: 26
I have now before me Bergmans Commentated
Chemica e lertio novorum Societalis Reg.
Leicul. Ups. actirum tomo exerpla. Upsalise
Joh. Edman. Reg. Acad. Typograph 1777. 4to It consists
of two papers: one exhibiting a chemical
analysis of the contents and productions
of Volcanos: the other a chem. analysis of the
several roots of pretious stones. In the first, p.
65 is an account of the Puzzolana, & which
is nearly the same thing, the Dutch Tras. It
gives the theory of the mortar and with those
substances most clearly & perfectly. I have therefore
extracted what relates to these subjects, which
is as follows.
16
In two specimens 100 parts of Puzzolana
I | II
Silicious (that is chrystalline) earth 55 | 60
Argillaceous 20 | 29
Calcarious 5 | 6
Calx of iron 20 | 15
100| 100
This substance <add> as some body knows mixt up with quick lime
slacked in water presently grows into a stone:
which most useful property is much illustrated
by the account above given of its composition.
17
The firmness of mortar depends in a general
view upon the lime water, with which
the whole . This attracts the
aerial acid from the atmosphere:
which gap/> saturation, the particles
which were separated 9this is rather
obscure) [ haurto sparticula soluta ] grow on as it were
to the others and glew them together, whereas
before they were connected only by a kind of
accompanied with a very weak
degree of cohesion. This combination is the sooner
effected, the quicker the water evaporates.
18 Common mortar is made with sand
a pure silicious earth: the particles of which
being like galss, neither take up water nor
contract
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Identifier: | JB/539/002/001"JB/" can not be assigned to a declared number type with value 539. |
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1780-01-11 |
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539 |
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002 |
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001 |
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Correspondence |
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Jeremy Bentham |
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