548 Meteorological Obfervations. 
the bottom of it is faftened to the index C, 
which it moves up and down the st, part of 
an inch at every revolution. Behind B is a 
wheel, containing two hundred teeth, which 
are moved by the threads of the {crew. This 
wheel carries the index B, which moves round 
the graduated circle divided into two hundred 
parts, while the fcrew moves one inch.—The 
fcrew A is moved by the hand, till the index 
C be exactly on a level with the furface of the 
mercury; and the index B fhews the height of 
the fluid. 
a 
§ Il. 
OBSERVATIONS on txt THERMOMETER. 
een Se 
Obfervations on the Thermometer at Liverpool, extratted 
from Mr. Hutcuinson's Fournal. 
Thefe obfervations on the Thermometer were 
made at twelve o'clock at noon. The Ther- 
mometer was raifed about forty feet above high- 
water-mark. It was placed undera table (to 
prevent the-rain having any effect upon it) 
facing the North, in an open obfervatory at 
the top of houfe. The houfe was confiderably 
elevated above the adjoining ones; and the ob- 
fervatory was as much expofed to the open air 
as poflible. 
1763, 
