Mr Babbage 07i Barometrical Measurements 
end of the pendulum-wire AB, Fig 9. it is strongly attracted 
Believe me. Dear Sir, very sincerely yours, G. Moll. 
Utrecht, Sih December 1821. 
Art. IV. — Barometrical Observations made at the Fall of the 
Staubbach, by J. F. W. Herschel, Esq. F. li. S. L. & E., 
and .Charles Babbage, Esq. F. R. S. L. & E. In a 
ter from Mr Babbage to Dr Brewster. 
My Dear Sir, 
I PROMISED a short time since to send you an account of some 
barometrical observations made by Mr Herschel and myself at 
the Fall of the Staubbach, during last summer. There are 
some circumstances attending the observations at the foot of the 
great fall, which seem worthy the investigation of other travellers 
who may visit tlie magnificent valley of Lauterbrunnen, and who 
may have more time than we had for the inquiry. 
The finest view of this beautiful cataract, is that which pre- 
sents itself to tlie traveller on descending the Wenger Alp, on 
his way from Grindelwald and Lauterbrunnen, as it is there only 
that the upper fall becomes visible. 
I have assumed the ground-floor of the inn where we were 
accommodated, as the point to which all the measurements are 
referred. There are several reasons for this, amongst which 
may be mentioned, that I had previously determined very ac- 
curately its height above the stream which passes through the 
valley, and that the observations I made at the inn were not 
completed until the instrument had in both cases been exposed 
to the atmosphere a full hour. 
We left the inn a few minutes after seven in the morning, 
and following a circuitous path, arrived in little more than an 
hour at a small wooden bridge, which traverses the torrent at 
some distance above the upper fall. It descends from this spot 
with great rapidity; and finding it inconvenient to follow its 
• As this ingenious apparatus was described in our last Number, vi*. Vol. VI., 
p. 178., without a reference to a figure, it may be sufficient to state, that in Fig. 9. 
AB is the brass pillar; CD the copper-rod; E the shallow glass-cup with mer- 
cury ; F the magnet ; G the descending rod of metal ; H the cylindrical cup ; I the 
second bar magnet ; and K the tlpck wire descending from the rod above. See the 
Quartet!^ Journal^ vol. XII. p. 283, 
