the Royal Society’s Injlruments . 385 
or that any which falls on the outer lip fhould dafh into 
the funnel. This veffel is placed on fome flat leads on 
the top of the Society’s Houfe. It can hardly be fcreened 
from any rain by the chimnies, as none of them are ele- 
vated above it in an angle of more than 25 0 ; and as it is 
raifed 3^ feet above the roof, there feems no danger of 
any rain dafhing into it by rebounding from the lead. 
The itrength of the wind is divided in the journal into 
three degrees; namely, gentle, brifk, and violent or 
ltormy, which are diftinguifhed by the figures 1, 2, and 3.- 
When there is no fenfible wind it is diftinguifhed by a 
cypher. 
In the future journals of the weather will be give a 
obfervations of the hygrometer. The inftrument in- 
tended to be ufed is of Mr. smeaton’s conftruftion, and 
is defer i bed in Phil. Tranf. vol. LXI. p. 198. It is kept 
in a wooden cafe, made fo as to exclude the rain, but to* 
leave a free paffage for the wind, and placed in the open 
air, where the Sun fcarce ever fhines on it. The inftru- 
ment and cafe are both a prefent to the Society from Mr.. 
smeaton. The hygrometer was laft adjufted in Dec.. 
17 7 5? a nd as the firing has now been in ufe upwards of 
five years,, it is not likely to want re-adjufting loom. 
Of the Far i at ion Compafs .. 
IN this inftrument, the box which holds the needle Is 
not fixed, but turns horizontally on a center, and has an 
index faftened to it, pointing to a. divided arch on the 
bra is- 
