254 Prof. J. Lovering on the Aneroid Barometer. 
eter is in danger of being broken when exposed to the perils of 
mountain-travel. In this case, the damage, however great, is 
known, and no error is introduced into science. Unless the tube 
is broken, the instrument is so simple in its construction that it 
is not liable to be injured at all. It is otherwise with the aneroid 
barometer. ‘'T'o appearance it is stronger than the old barometer 
and can bear a greater strain without being broken. On the 
other hand, we can easily foresee that it may be materially injured 
without attracting the notice of the observer at the time, and 
in this way may conceal its own infirmities under its apparent 
strength. 
Taste I. , 
ge |ses 25 cee ] 
“$o.| 5 3E_ § <3e, 5 + g | 
1849 £s=s 83 Eas § rt A 3: BS E 
he, 6 oe lye ote 2 -ao09 wrt oe Ay 
SmaSsgi ce ,3s c=] SAS S.E p = 
see "|ephes| & =es*| op A 
a= mom mF 5 fh 
Sept. 24.) 4.27 4.258 -0124+ |Sept. 27. 10.42 20.721 10,.301- 
78 7.673 -107-4+ 10.40 19.338 8.938- 
3 0.10 | 15.830 730- 10.38 236 7-856- 
2 0.07 | 16.030 5.960- 0.38 7.294 6.914- 
IS 978 | 10.150 370- | os 10.36;{ 16.382 $.992~ 
ez 9-44 268 172+ | ©F 10.30 15,030 4.730- 
2 46 216 2444 8s 10 02 10.140 120- 
Zu 95 7.264 2564 > 4, 9 60 268 332+ 
Be | 648| 6.232 24841 83 8.68 246 434+ 
: = 5.48 4.240 240+ FI g 7.72 7.224 
4.45 4.388 062+ o 6.79 6.332 458+ 
Bib 3.256 m4+] og 5.61 5.270 340+ 
3 2.32} 2.214 I 4.49 .208 282+ 
& 3.50 3.256 244+ 
9.56 2.254 I 
Sept. 26.) 10.13} 18.537 8.407- |Sept. 29,| 10.63 23.035 12.405- 
10.11] 17.294 7.184- 10.5 16.262 5.672+ 
= 1o 11} 16.382 6,272— 10.2 10.220 Or 
aS 10.07 5.280 5.210— 6S 9-95 328 422+ 
| 22 9-75 | 10.220 470- | S| 9.02 8496 594+ 
ao 36 .268 .092+ wo | ee 7.294 636+ 
| ee 71 316 394+ | BE | 6.93 6.332 : 
$s 7:67| 7.274 396+ | BS - 5.270 530+ 
2 5 667} 6.262 4084 = F |. . 4.63 4.238 392+ 
Es 5.53| 5.120 410+ i E 
s 3 4.238 432+ = 5 | 2.45 2.224 2264 
& 3.34] 3.206 134+ 
2.30] 2.154 146+ { | 
Dec. 4. The Aneroid barometer was placed under the receiver 
of a condensing pump and it was observed that the index only 
moved forward to 31, which corresponds to 31 of the mercurial 
barometer. 
