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<head>TRAS 15</head> <p> Tuesday Jan: <unclear>26</unclear><lb/>I have now before me Bergmans Commentated<lb/> <gap/> <foreign> Chemica e lertio novorum Societalis Reg.<lb/> Leicul. Ups. actirum tomo exerpla. Upsalise <gap/></foreign> <lb/> Joh. Edman. Reg. Acad. Typograph 1777. <add> 4to</add> It consists<lb/> of two papers: one <gap/> exhibiting a chemical<lb/> analysis of the contents and productions<lb/> of Volcanos: the other a chem. analysis of the <lb/> several roots of <sic>pretious</sic> stones. In the first, p.<lb/> 65 is an account of the Puzzolana, & which<lb/>is nearly the same thing, the Dutch Tras. It <lb/> gives the theory of the mortar and with those<lb/> substances most clearly & perfectly. I have therefore<lb/> extracted what relates to these subjects, which <lb/> is as follows.</p> <head>16 | |||
</head> <p> In two specimens 100 parts of Puzzolana<lb/> <!-- figures under two columns headed I and II --> I | II <lb/>Silicious <add> (that is chrystalline) earth 55 | 60<lb/> Argillaceous 20 | 29 <lb/> Calcarious <hi rend="underline">5</hi> | <hi rend="underline">6</hi> <lb/> Calx of iron 20 | 15 <lb/> <!-- total --> 100| 100 </p> <p> This substance <add> as some body knows </add> <sic>mixt</sic> up with quick lime <lb/> slacked in water presently grows into a stone: <lb/> which most useful property is much illustrated<lb/>by the account above given of its composition.</p> <head>17</head> <p> The firmness of mortar depends in a general<lb/> view upon the lime water, with which <lb/> the whole <gap/> <gap/> <gap/> . This attracts the <lb/> aerial acid <gap/> <gap/> from the atmosphere:<lb/> which <gap/> gap/> <gap/> saturation, the particles<lb/> which were <gap/> <gap/> separated 9this is rather <lb/> obscure) [ <foreign> <gap/> <gap/> <gap/> <gap/> <unclear>haurto</unclear> sparticula soluta <gap/> </foreign>] grow on as it were<lb/> to the others and <sic>glew</sic> them together, whereas <lb/> before they were <add>connected</add> only by a kind of <gap/> <lb/> accompanied with a very weak<lb/> degree of cohesion. This combination is the sooner<lb/> effected, the quicker the water evaporates.</p> <head>18</head> Common mortar is made with sand <lb/> a pure <sic>silicious</sic> earth: the particles of which <lb/> being like galss, neither take up water nor <lb/> <add> contract</add> </p> <pb/> | |||
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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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