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A Diner chez les 3 Tonds
J' ai été parlèr avec Poore ce matin: & j'en ai remportè tirè des avis
tres utiles. Je l'ai trouvè parfaitement instruit de tout ce qui regarde
L'Horologerie. Pour te faire plaisir (pour ne pas dire davantage)
en deux mots (mais ne va pas me chicaner sur le nombre)—
Je l'ai tro Votre projet est nouveau: Je l'en ai trouvè bien
persuadè. mais aussi vous fait il des objections bien solides instructifs &
bien dignes de votre attention. Je ne scais pas si il y en a contre lesquelles vous n'êtes pas en garde A Pendulum clock it cannot be
To keep such an one on board a
</del>' ship is found absolutely impracticable
on acco even with all contrivances of Gymbols &c &c. It
must be a Watch that is a Machine Time piece that goes by
a spring - there are it seems no other prima mobilia in use.
A Watch must be wound up not seldomer than every 15 or
18 hours: how will you wind it up so often? It must not be
taken out. that sudden change from hot to cold you know would derange the whole oeconomy of the
spring. This I believe you are aware of. 2. There is no
knowing a priori how metal may perform in a degree of heat so
much superior to that of the Atmosphere. This however is to be apprehended,
The teeth and pinions &c and &c which fitted in the heat of the
atmosphere will fit now no longer. It is not certain that they will
expand in proportion — the male female parts of the work may
not no longer admitt the male: at least to play with equal freedom as before.
Metals specifically the same are composed of strata of unequal
densities and degrees of expansibility. The ratio of expancibility between
two strata may in different degrees of heat be different.
Courage, mon ami. It was in obviating the inequalities of expansion
that Harrison time-pieces were principally defective. He
could temper from long practise an piece of metal I should say combinations of metals
so as to make it answer the purpose: but then he could not give any
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Identifier: | JB/538/008/001 "JB/" can not be assigned to a declared number type with value 538.
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1776-02-24 |
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538 |
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008 |
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001 |
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Correspondence |
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Jeremy Bentham |
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