830 Report ' of the Committee 
better to enable us to do this, we made ufe of a thermo- 
meter tube, filled with quickfilver in the fame manner 
as a thermometer, only without any ball to it, or a ther- 
mometer without a ball, as we may call it. A fmall brafs 
plate was fixed to the tube near the top of the column 
of quickfilver, to fliew the heat as in a common ther- 
mometer. In all our experiments with the long ther- 
mometer in open veflels, this tube without a ball, was 
placed by its fide ; whence, as the quickfilver in the tube 
of the long thermometer could hardly fail of being 
nearly of the fame heat as that in the tube without a 
ball, we knew pretty nearly the heat of the quickfilver 
in the tube of the former, and confequently how much 
higher it would have flood if the quickfilver in its tube 
had been of the fame heat as that in the ball. F or exam- 
ple, on October 19, the long thermometer tried in an 
. open veffel, the water boiling faft, flood x°.65 lower than 
it did when tried in fleam the fame day, the quickfilver 
in the tube without a ball Handing at the fame timfc at 
to 9 0 : we xnay therefore conclude, that the heat of the 
quickfilver, in that part of the tube of the long thermo- 
meter which was not immerfed in the water, was alfo 
10 9 0 ; and confequently, as that part of the tube con- 
; tained about 170°, the thermometer flood , or 
i°5 2 ' 
