ik coc aieaa i 
ey Mr. BOWERY 5 Methoul ‘of swiilettag 
-pofe; in hopes either of attaining by this method a greater de- 
_ gree of accuracy than T could expect from any other means, or 
of having what I Rad already done confirmed by a Aeris of 
experiments upon a different principle. 
But in the profecution of thefe experiments 1 have, to my 
“great mortification, hitherto failed of fuccefs; and I fhould. 
have contented myfelf for the prefent with faying little more 
than this, if fome phenometia had not occurred, which pine? 
to me not unworthy of farther inveftigation. | 
The authors obferve, that if ice, cooled to whatever degree 
below the freezing point, be expofed to a warmer atmofphere, 
it will be brought up to the freezing point through its whole 
~mafs before any part of its furface begins to hquefy ; and that 
-confequently ice, beginning to melt on the furface, will be 
always exactly of the fame temperature, viz. at the freezing 
point; and that if a heated body be inclofed in a hollow {phere 
af fuch ice, the whole of its heat will be taken up in lique- 
fying the ice; fo that if the ice be defended from external 
warmth, by furrounding it with other ice in a feparate veftel, 
the weight of the water produced from it will be exaétly pro- 
portional to the heat which the heated body has loft; or, im 
other words, will be a true phyfical meafure of the heat. 
For applying thefe prinetples in practice, they employ’a tim 
veel, divided, by upright concentric partitions, into. three 
compartments, one within another. ‘The innermoft compart- 
ment is a wire cage, for receiving the heated body. The fecond, 
jurrounding this eage, is filled with pounded ice, to be melted 
by the heat; and the outermoft is filled alfo with pounded ice, to 
detend the former from the warmth of the atmofphere. The 
furft of thete ice compartments terminates at bottom in a ftem 
ike a funnel, through which the water is conveyed off; and 
the other ice compartment terminates in a feparate canal, for 
difcharging 
“> 
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