C 9 ] 
I find this Machine extremely fenfible and accu- 
rate} it will alter io Degrees in a Night, and as 
many in a Day } and has, I think, the following Ad- 
vantages : 
1 . It is more portable than any, except that of the 
wild Oat } and, upon any Accident, more eafily and 
fpeedily rectified than it, or any other whatever. 
2. Being graduated from abfolute ‘Drynefs , it is 
beft calculated for the Difcovery of the true State of 
the Air, as to Moifture. 
3 . The near Gorrefpondence between the Degrees 
on the graduated ‘Plate , and the Weight of the Moift- 
ure neceflary to be imbibed or exhaled, to make 
either Brachium of the Balance preponderate every 
fuch Degree, gives it the Preference to any other. 
For a more per fed Idea of this Machine, fee Tab. 
I. Fig. i. where it is viewed on the Infide, the Back 
being Hid up. At Fig 2. is reprefented the Plate 
with its Graduations and Index, as it fiiould appear 
on the Front of the Cafe. 
SECT. IV. 
Of the Anemofcope . 
'T'HE Anemofcope is a Machine four Feet and a Quar- 
-■* ter high, confiding of a broad and weighty Pedef- 
tal , a Pillar fattened into it, and an iron Axis , of about 
half an Inch Diameter, fattened into the Pillar. Upon 
this Axis turns a wooden Tube , at the Top of which 
is placed a Vane, of the fame Materials, 21 Inches 
long, confiding of a Quadrant, graduated and fhod with 
an iron Rim, notched to each Degree ; and a Conn - 
terpoife , of Wood as in the Figure, on the other. 
B Through 
