Mr Waddell on a Chinese Mangle > 75 
I have the pleasure of communicating to you a very interest- 
ing observation of an occultation of Jupiter by the Moon, ob- 
served by Dr Olbers at Bremen. The weather was not favour- 
able ; the air being so thick, that the immersions and emer- 
sions of the satellites of Jupiter could not be observed with dis- 
tinctness. The belts on Jupiter were however sufficiently clear. 
Magnifying power 110. 
October 18. 1821. — Mean time at Bremen. 
Immersion of preceding limb, - 5 h 26'14".2 
Complete immersion, * 5 29 36.2 
Beginning of emersion, - 51 29.0 
Complete emersion, - 54 38.0 
Dr Olbers adds, that the immersion of the preceding limb of 
Jupiter required particular attention. On account of the sphe- 
roidal figure of the obliquely entering planet, it was difficult to 
observe the moment when the invisible dark limb of the moon 
made the first impression on it. 
I shall here subjoin a similar observation made by M. d’An- 
gos, Knight of Malta, of an occultation of Venus by the Moon, 
on April 12. 1785, with an achromatic telescope of feet. 
Contact of limbs, - 
The lower horn disappears, 
Venus emerges behind the bright limb 
of the Moon, - 
The lower horn emerges, 
0 h S2' 12' Apparent time at Malta. 
0 32 40 
1 56 18 
1 56 48 
In the year 1824, an occultation of Uranus by the Moon 
will be visible in the East Indies, &c. 
Art. XIV .— Account of a Chinese Mangle. By Andrew 
Waddell, Esq. F. R. S. E. In a Letter to Dr Brewster. 
Dear Sir, 
I have the pleasure to send you a drawing and description of 
a Chinese Mangle , the model of which you saw at my house, 
and which you were inclined to think was worthy of a place in 
the Edinburgh Philosophical Journal. 
I do not recollect any where to have seen a description of it, 
although it was as far back as the year 1786, that I first saw it 
