72 Sir Thomas Brisbane on Astronomical Observations 



tached to the vertical surfaces of the cube, were equally in- 

 fluenced, their radiating powers being the same, and their ac- 

 cessions of moisture equal ; but in this last experiment, the 

 quantities deposited on the sheltered, and unsheltered surfaces, 

 were in the ratio of eleven to three ; and it is remarkable also, 

 how very nearly the effect produced by the direct action of 

 the wind, on the eastern surface, approximates to its lateral 

 action on the northern and southern. 



It is worthy of observation also, that although the western 

 surface of the cube was, from its position, much more sheltered 

 from the wind's influence, than the upper surface, yet the in- 

 crement gained by the latter, exceeded, in a two-fold ratio, that 

 of the former. The upper surface, moreover, must have been 

 exposed just as much to the lateral influence of the wind as 

 the northern and southern surfaces, and the superior energy 

 of its radiating power, arising from position, is strikingly 

 shown by its increment of moisture, amounting to 10 grains, 

 when the additions to the last mentioned surfaces were only 

 two grains each. 



Plymouth, May 10, 1825. 



Art. XI, — Astronomical Observations made at the Observatory 

 of Paramatta in 1824. Communicated by his Excellency 

 Sir Thomas Brisbane, K. C. B. F. B. S. Lond. and Edin. 



The following important observations have been just receiv- 

 ed by the Editor from Sir Thomas Brisbane : 



1. Eclipse of the Moon of January 1st 1824, observed at Paramatta. 



1824. "• M. s. — 



Jan. 1. Eclipsed, beginning at 1, 23, 59, 50, by sydereal clock. 



rev. div. 

 Diameter of the sun near noon by micrometer = 30, 222 



h. m. s. rev. div. 



At 1, 32, 17, dist.by micrometer = 22, 695 



21, 373 

 20, 343 

 20, 008 

 19, 120 

 18, 314 

 „ 43 set among the trees. 



h. m. s. — 

 Beginning of eclipse at 6, 44, 26, 82, mean time. 



