his Thermometer with the common mercurial ones. B09 
| A, isrwlarge funnel, filled with a folid mafs of ice!)..B sa 
cavity in the middle of this ice, formed, part of the way, by. 
feraping igith a ikmife, and for the rematming: part, by boring 
with a hot iron wire. C, one of my thermometer pieces, 
which ferves forthe heated body, ‘and refts upon a coil of brafs 
wire: it had previoutfly been burnt with ftrong fire, that there 
might be no danger of its fuffering any further diminution of 
its: bulk by being heated again for thefe-experiments.. D, a 
cork {topper in the orifice of the funnel. E, thie exterior veflel, 
having the {pace between its fides and the included funnel A, 
filled with pounded ice, asa defence to the ice in the funnel. 
F, a cover for this exterior vefiel, filled with pounded ice for the 
fame purpofe. G, a cover for the funnel,; filled alfo with 
pounded ice, with perforations in the bottom for aul wIES) the 
water tromthis ice to pafs down tothe funnels, 
. The thermometer piece was heated m boilmg water, taken 
up with a pair of {mall tongs equally /heated, dropped. in- 
ftantly into the cavity B, and the covers put on as expeditionfly 
as poflible; the bottom of. the funnel being’ pievioully. corked, 
that the water might be detained ull at thould. part with,all 
its heat, and likewife to prevent the. water from the other: ice, 
which ran down on the outfide of the funnel, from, a 
with it. WW | | 
‘After ftanding about ten minutes, the er was ae out; 
wiped dry, and uncorked over a weighed cup: the water that 
ran out weighed 22 grains.’ Thinking this quantity too {mall, 
as the piece weighed 72 grains, I repeated:the experiment, and. 
kept the piece.longer in the funnel; but the water this-time 
weighed only 12 grains. ‘Being much diflatisfied with. this 
tefult, I made a third trial, continuing the: picce much longer 
in the cavity ; but the quantity of water was now ftul lefs, not 
| 7 amounting 
| 
