i \6qi ) 
ObfervAtions mnde with this new Barofeope. 
• 
1. Whilethe y of the common Barofcope is often known 
rto l>e ftationary 24 hours togetlier, the BubBIe of the 
•new Barofc^pe is rarely found to ftand ftill i minute. 
2. Suppofe the Air's Gravity encreafing, and accor- 
dingly the Bubble afcending, during the Time that it 
afcends 20* Inches, it will have m.any fhort defcents, of 
theQuantity of i Inch, i, 2, or more Inches, each of 
which being over it will afcend again. Thefe retro- 
ceffions are frequent, and of all Varieties in quantity and 
duration, fo that there is no judging of the general 
courfe of the Bubble by bare infpeftion, though yoirfee 
it moving but by waiting a little time. 
5. A fmall Blaft of Wind will make the Bubble de- 
fcend; a Blaft that can't be heard in a Chamber of the 
Town, will fenfibly force the Bubble downward. The 
Blafts of Wind fenlible abroad caufe many of the a- 
bovefaid Retroceffions, or Accelerations in the general 
Courfe; as I found by carrying my Barofcope to a 
Place where the Wind was Perceptible. 
4. Clouds make the Bubble defcend. A fmall Cloud 
approaching to the Zenith works more than a great 
Cloud near the Horizon. In Cloudy weather the 
Bubble defcending, a break of the Clouds ( or clear 
Place ) approaching to the Zenith, has made the Bab-. 
b!e to afcen#; and after that break had pafs'd beyond 
the Zenith a confiderable Space, the bubble again de- 
scended. 
5". All Clouds ( except one) hitherto by m.e obferv'd, 
bave made the Bubble to defcend. But :the x)ther day 
the Wind being A^f^r//-?, and the Courfe of the bubble 
defcend- 
