( J4J ) 
periraents obferved at z 5 ", 9f "', and at the Top it 
defended to 14", n fo that it fell juft io Lines, 
for 714 Feet, which gives about 71 ‘Paris Feet for a 
Line, it the Heights anfwering to every Line were fuo- 
poled to be equal. 
I muft here once for all defire the Reader to take 
Notice, that I have made ufe in this Paper of Parts 
Meafure, namely, of Toifes ( 0 ) Feet (') Inches f") 
and Lines ( "/). Eyery Toife is reckoned at fix Foot, 
the root is divided into twelve Inches, and the Inch 
into twelve Lines. 
The Heights of the Barometer at the Bottom and 
lop ot the Mountain being thus given, the Height of it 
fliould be, according to M. Mariotte, ii 6°, o', 8» it"' 
or 6^6Paris Feet,8",n '"which falls 17', 3//, 
Ihort of the true Height, and according to QaJJini if5°’ 
3 /» 8 ”’ r t ' iat , is > 9 XI "Paris Feet, 8'/, which exceeds 
the true Height by 207 Paris Feet, 8 Inches 1 whereby 
it appears, that the Table made according to the Rules 
of Mariotte is much preferable to that of CaJJini the 
Younger. The fame was likewife confirmed by ano- 
ther Experiment made in June 1715-, upon the Steeple 
of our Cathedral at Zurich. At the Foot of the 
Steeple the Barometer ftood at 2.6", io'" and at the 
Top at z6l', 7 s'", and the Height of the Steeple was 
found by the Line of 141 Paris Feet, 4 Inches, which 
gives very near 69 Paris Feet for one Line. Accord- 
ing to the Table of Mariotte , the Height of the SteeHe 
fhould have been of 237 Paris Feet, according to 
LaJJim, z 65, and according to the new Calculation (of 
which by and by) made purfuant to the Experiments 
above it comes to 243 0 , t6", 2//', or about two Foot 
more than the true Height. 
D d d d 
It 
