the Point of Mercurial Congelation, 
Thermometers defer lbed y 
A. Reprefents a mercurial thermometer, with an air-hulb at 
the top, graduated 628 degrees below the cypher, and 
marked at every fecond degree. Makers nairne and 
elount ; the fcale box- wood. 
B. Another mercurial thermometer graduated to 526° below 
the cypher, each line reprefenting 2°, made by nairne 
and blount ; the fcale box-wood. 
C. Is a fine mercurial thermometer, with an air-bulb at the 
top graduated 2300° below the cypher, each division con- 
taining 5 0 ; the fcale made of box, by throughton. 
D. A fmall fpirit thermometer on a box fcale, made by 
throughton, and divided to every fmgle degree down 
to 160 0 below the cypher. 
E. Another fpirit thermometer, by the fame maker (through- 
ton) graduated 90° below the cypher; the fcale box. 
F. A fmall mercurial thermometer, on an ivory fcale, divided 
at every 5 0 between 220° above and 250° below the 
cypher ; made by nairne and blount. 
G. Another mercurial thermometer, eyery way like the laft 
mentioned, except only reaching from 21 5 0 above to 250° 
below the cypher ; by nairne and blount. 
H. A fpirit thermometer, made by nairne and blount, 
with which I have made meteorological pbfervations from 
the year 1 774. 
2 
Ther- 
