8 o 3 Report of the Committee 
of the thermometer with which he tries the heat of the 
liquor; or, what will be much better, he may have a 
tube without a ball, fuch as is above defcribed, fattened to 
the frame of the thermometer, on one ttde of the tube ; 
or if he has two fuch tubes, of different lengths, it will 
be ftill more accurate. 
To avoid the inconvenience of this correction, per- 
haps it may be thought, that both in adjufting the boiling 
point and in trying the heat of liquors, it would be better 
that not much more than the ball cf the thermometer 
fhould be immerfed, and that the tube ftiould be held in- 
clined in fuch manner as to be heated as little as poflible ; 
as it may be laid, that by this means you will find the heat 
of liquors pretty nearly, without the trouble of making 
any correction ; and that, though in ttricttnefs a correction 
would be required in obferving the heat of the air with 
where between b and a as at e, and cut off there; after which it mud be held 
with the end d upwards, fo as to make the column of quickfilver run to the 
extremity E : by this method of filling it is plain, that no fenfible quantity of 
air can be left between e and the column of quickfilver; but yet the quickfilver 
will be apt not to run fufficiently clofe to the extremity E, as the weight of the 
column will be fcarcely fuflicient to force it into the narrow fpace which will 
commonly be left in fealing the tube, efpecially when held nearly horizontal : 
for this reafon it will be proper to open the tube at d, fo as to let in the air, 
and then feal it again. It muff be obferved, that the fpace left between d and 
the column of quickfilver ought not to be lefs than the tenth part of the length, 
of the column of quickfilver, as otherwife the included air might be too much 
compreffed by the expanfion of the quickfilver when much heated. 
fuch 
