* 33 ° Mr. hutchins^s 'Experiments for afcertnining 
the time by the watch, and was the effe£t of chance; for thff- 
firft freezing mixture, which had been ufed in the fecond expe- 
riment, {landing in the glafs clofe to me (and the other inftru— 
merits being long ftationary, did not require particular atten- 
tion), I took down the thermometer (G) and charged its cylin- 
der with quickfilver, as in the other examples, and fufpended 
it in the ; old.mixture, together with the mercurial thermometer 
(B) and a fpirit thermometer ; the mixture feemed to have loll 
much of its coldnefs, as appeared by the thermometers. It 
feemed very extraordinary to me, that the apparatus, after 
having been fo long flationary at 43 0 , fhould yet contain 
fluid quickfilver ; but both myfelf and afliflant thought 
it was thicker than ordinary, as it did not run freely, 
but feemingly in pieces (not globules) : however we put it 
back again into the mixture, and fet it by as of no further 
ufe ; but returning after breakfaft, we found it was firmly 
frozen, fo as to give no appearance of fluidity though the in- 
cluded thermometer was only at 40°, which I look upon to be 
the exa£f freezing point of quickfilver; and then the congelation 
was in fa£t begun before, and effected by only a longer conti- 
nuance in the fame degree of cold. 
It may be neceflary to mention, that the fpace between the 
bottom of the ivory fcale to, the bulb of the thermometer (F) 
which made part of the apparatus ufed in the fecond experi- 
ment, was two inches nine-tenths ; and when taken with a 
• - • • • * t 
pair of compaifes (dividers) with one foot placed at the cypher o 
on the graduated fcale, the other extended to 148° if meafured 
upwards, and to 165° if meafured downwards, for the divifions 
were unequal. 
A 
Experiment 
