404 Mf. de Lire’s Barometrical Obfervations on 
at the bottom, which makes the barometrical column 
always fhorter in thefe than it is in a plain tube in the 
form of a fyphon, as I have fhewn in my treatife on the 
Modifications of the Atmofphere. Accordingly this was 
the cafe in all thefe Barometers; they did all hand lower 
than mine, but varied from each other, according to par- 
ticular circumftances, depending chiefly on the diame- 
ter of the tube, and the figure of the ciftern. 
In going from Hanover to the Hartz I went through 
Gottingen, where I did not flop then, becaufe I wilhed 
to make ufe of. the fine weather. I left it therefore with- 
out having fettled any thing about correfponding obfer- 
vations of the Barometer, Profeflor lichtenberg having 
been kind enough to undertake the care of procuring 
them for me ; the comparifon of the inftruments being 
deferred till my return. Profeflor erxleben was accord- 
ingly 
trique y eft toujours plus courte, que dans un tuyau fimple en forme de fyphon ; . 
eomme je l’ai expHque dans mon Ouvrage fur les Modifications de l' Atmofphere, 
C’efl aufli ee que je trouvai dans Lous ces Barometres: ils fe tenoient tous plus 
has que le mien; mais diverfement, fuivant quelques circonftances particulicres 3 
dependantes principalement du diametredu tube, et de la figure du refervoir. 
En allant de Hanovreau Hartz, je paffai par Gottingue, ou je ne m’arretai* 
point talors, parce que je youlois profiter du beau terns. J’en partis done, fans 
avoir rien determine pour des obfervations -correfpondantes du Barometre; M. le 
Profefleur lichtenberg ayant bierr voulu fe charger du foin de m’en procurer; et 
renvoyant a mon retour la comparaifon des inftrumens. II s’adreffa pour cet effet 
a M. le Profeffeur erxleben; parce qmil avoit un Barometre faitd’un fimple 
tube 
