172 
at the critical moment so as almost completely to hide the sun. 
My last view of Mercury was at lh. 40m: 9-2s. p.m. Sy 
mean time, very near to internal contact 
My 
eye, however, was unable to adjust itself readily to the large 
increment of light; so that, to my great disappointment, If 
to observe either phase of the egress. 
The position of our telescopes has been deduced from that of a 
fixed point in the trigonometrical survey, with which it has 
been connected by triangulation. ; 
e observatory used by Mr. Brooks at the same time Was 
86} links north and 30 links west from the one referred to in this 
report. 
Positions of the stations near Bathurst, used for the transit of 
Mercury by Messrs. Conder and Brooks :— 
Latitude. sepen 
Mr. Conder’s station ............... 33-25-45°5 UW gee 
Mr. Brook’s station . 33-25-44-9 149-33-4 
Report from J. Brooks, F.R.G.S., Trigonometrical Survey 
I have the honor to forward herewith report on the transit 
ereury as observed by me at Bathurst on the 8th instant. 
Telescope. tn. aper- 
Telescope used was by Troughton and Simms, of 3jin. lighter 
ture, stopped down to 3-in. ; eye-piece for ingress 110 ot by 
-of the two coloured shades; the sun’s light being reflecté 
Definition. : 
With a view to testing the definition I went to the pag 
about an hour before ingress. Day was clear, except Hd ese 
fleecy clouds to.west and north-west, with hardly any va ally is 
light drift from south. A group of sun-spots, lying g°? locality 
direction of sun’s centre, very happily marked about mre 
* The longitude of Sydney Observatory used for the Trig 
Survey is 10h. 4m. 50-Sis, 
