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 ftrong Fire, defcribed in Vol. LXXII. of the Philfo ofo phical 
Tranfactions, with the common Mercurial Ones. B yy Mr. Jane 
Wedgwood, F. R. S. Potter to Her Majefy. 
AXVIL. An Antemps to compare and poems the Ti ore jor 
Read May 13,1784. 
HIS thermometer, which I had the honour of laying 
before the Royal Society in May 1782, has now been 
found, from extenfive experience, both in my manufactories— 
and experimental enquiries, to anfwer the expectations I had 
conceived of it as a meafure of all degrees of common fire © 
above ignition: but at prefent it {tands in a detached ftate, not 
connected with any other, as it does not begin to take place till 
the heat is too great to be meafured or fupported by mercurial 
ones. 4 
What is now therefore wanting, to give us clear ideas of 
the value of its degrees, is, to connect it with one which long 
ufe has rendered familiar to us; fo that if the fcale of the 
common thermometer be continued indefinitely upwards as a 
ftandard, the divifions of mine may be reduced to that feale, 
and we may thus have the whole range of the degrees of heat 
brought into one uniform feries, exprefled in one language, and 
comparable in every part, from the loweft that have hitherto 
been produced by any artificial freezing mixtures, up to the 
higheft that can be obtained in our furnaces, or that the mate~ 
rials of our furnaces and veflels ean fupport. ' 



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