measurement of Snowdon by the Thermometrical Barometer. 2 99 
Table II. For converting observed differences on the Scale of 
the particular Thermometrical Barometer into feet of elevation . 
Fahrenheit. 
Parts on the 
Scale of the 
Thermo- 
metrical 
Barometer. 
Height in 
feet. 
Horrespon- 
ient point 
of Baro- 
meter 
nearly. 
300 
702 
30,8 
213 
225 
528 
,6 
200 
46 9 
>?4 
IOO 
235 
> 2 7 
212 
O 
0 
3 °’° 
IOO 
236 
29,73 
200 
47 2 
,46 
211 
22 S 
53 1 
>4 
30° 
7°9 
29,2 
400 
946 
28,92 
210 
450 
1064 
,8 
500 
1184 
» 6 S 
600 
1422 
A 
209 
675 
1600 
,2 
700 
1660 
28,1 
800 
1899 
27,85 
208 
900 
2138 
1000 
2378 
1 100 
2618 
207 
1125 
2678 
1 200 
2859 
1300 
3 100 
206 
135 ° 
3221 
1400 
334 i 
1500 
3583 
205 
1575 
3766 
1600 
3 82<5 
1700 
4 c6 9 
204 
1800 
43*3 
1900 
455 6 
2000 
4800 
203 
2025 
4 86 3 
2 1*00 
5°45 
2200 
5290 
202 
2250 
54 I 5 
2 4’37 
A simple proportion applies this Table to the use of any 
other thermometrical barometer of greater or less sensi- 
bility. 
As the instrument I was about to employ had a scale of 
only four inches, or 800 parts, and could therefore scarcely 
