z 
TRANSACTIONS OF THE SECTIONS. $1 
force of the wind, and that the absolute force would be found by multiplying the 
horizontal force by the secant of the inclination. The vertical anemoscope might 
thus be usefully combined with one of the horizontal anemometers now in use in 
meteorological observatories. Among the general results of Prof. Hennessy’s obser- 
vations, it appears that the wind rarely blows in a perfectly horizontal direction, 
The deviations from that direction, although usually very small, are sometimes very 
remarkable, and follow each other in such a way, especially during strong breezes, 
as to indicate a species of undulatory motion in the wind. The force of the wind 
given by horizontal anemometers is thus almost always a little inferior to its actual 
mechanical energy. True vertical currents are sometimes indicated by the anemo- 
scope when the flange points continuously and steadily in an upward or downward 
direction. This is usually observed when the air is otherwise in a comparatively 
calm state. The vertical ascending currents, which have been long supposed to take 
place over the land during fine weather, in connexion with the phenomena of sea 
and land breezes, were often very distinctly observed. The obvious connexion of 
vertical currents with changes of temperature and other atmospheric disturbances, 
points to the importance of observing them, as well as the horizontal movements of 
the air. 
On the Discovery of the Asteroid, No. 46, on the 17th of August, 1857, by 
Mr. Pogson, at Oxford. By Dr. Luz, P.R.S, 
Dr. Lee said, on the morning of the 17th of August, being in Oxford, I received 
from Mr. Pogson the following statement :—I have the pleasure of sending you 
the reduced observations of a new planet, either Daphne, or the forty-sixth Asteroid, 
most probably the latter, which I found last night with your beautiful Smythian 
telescope. Mr. Frodsham’s chronometer and Mr, Dollond’s ring-micrometer have 
done me good and unexpected service, and we are now tried trusty friends. The 
following were my observations, which have taken nearly all night to reduce :— 
Oxford Mean Time. Apparent R. A. South Declin. 
hm 8 h m s Piha at 
August 16, 9 49 10 20 20 27°16 ~ 16 20 53°7 
Fa », 10 47 24 20 20 25°61 16 21 2:0 
aa » 12 29 51 20 20 22°69 16 2) 1874 
Daily motion 39” retrograde, 3’ 34” south, magnitude 114, observations duly cor- 
rected.”’ This discovery was made under considerable difficulties and discomforts; 
but the zeal and intelligence and the practised eye of the observer were able to over- 
come them. Mr. Pogson has been for some time engaged at his leisure hours, and 
after his public duties at the noble Radcliffe Observatory were terminated, in making 
maps of stars in the region near the ecliptic, and by a course of systematic investiga- 
tion he discovered, in 1856, the planet Isis (No. 42) by these means, with the equato- 
real in the Radcliffe Observatory, which fact is mentioned in the Report of the Council 
of the Royal Astronomical Society for the year 1856, during the presidency of the 
distinguished astronomer, Mr. M, Johnson, F.R.S., the director of that observatory. 
This present planet, No. 46, was discovered by him with the aid of a similar star- 
map, but not in the Radcliffe Observatory, with all the conveniences and appliances 
which are to be found in such an establishment,—but at his private residence, and 
in a small garden, not larger than this room, and in the open air, and with the aid 
of a common lamp,—but with the assistance of Mrs. Pogson, who wrote down the 
chronometer times as he called them out, in order that his eye might not be troubled 
with turning from the eye-piece of his telescope to a paper. On the evening of the 
16th of August, whilst sweeping for variable stars, a stranger appeared in the tele- 
scope which was not in Mr. Pogson’s map of stars, and it was therefore strictly 
examined, and this led to its detection; and the evening being most favourable for 
observation, after a series of three courses of observations, it was found to be a planet. 
It was situated between 6 and mw Capricorni, in hour 20. Mr. Pogson describes the 
object-glass of his telescope with great admiration; and the ring-micrometer, which 
was made expressly for it by Mr. Dollond, and the chronometer, which has been 
lent to him by the liberality of Mr. Frodsham, as being excellent; and it is worthy 
of remark, that the object-glass of the Smythian refractor, which was made for. 
