on Spirituous Liquors . ^35 
reached from 15 to no degrees. The part of it particularly 
made ufe of in theft experiments, namely, from 30° to ioo°, 
meafured 6,82 inches. The fcale was made of ivory, and ear- 
ned divifions to every fifth of a degree, the (quarters of which 
could be readily eftimated ; fo that the inftrument could be 
read off to twentieths of degrees. When the thermometer 
was immerfed in the weighing-bottle, the liquor reached up 
nearly to what would have been o° upon its ftem ; hence, as 
the heat of the room in which the experiments were made 
remained about 6o°, the corre&ion for the different heat of the 
quickfilver in the ftem from that in the ball of the thermome- 
ter was calculated according to Mr. Cavendish’s table, given 
in the LXVIIth volume of the Philofophica! Tranfa&ions. 
Thus the real heat of the fluid in the weighing-bottle being 
found, an allowance was made to reduce it to the exa£t degree 
indicated on the fcale of the thermometer. 
The precife fpecific gravity of the pure fpirit employed was 
,82514; but to avoid an inconvenient fra&ion it is taken, in 
conftru&ing the table of fpecific gravities, as ,825 only, a 
proportionable dedu&ion being made from all the other num- 
bers. Thus the following table gives the true fpecific gravity, 
at the different degrees of heat, of a pure re&ified fpirit, whofe 
fpecific gravity at 6o° is ,825, together with the fpecific gra- 
vities of different mixtures of it with water, at thofe different 
temperatures, as far as equal parts by weight* 
TABLE 
