' A Survey, &c- 61 
supplies of gram for my followers: I was consequently obliged to buy 
erain and to send it off before me, so as to. form little magazines, at the 
places I intended to halt at; and as £ learnt that several. of the Sangas 
or spar” bridges over the river had: been destroyed’ ‘by avalanches of © 
snow, I setit a Inge ea of labourers to re-establish oD, 
Conswwerine, Revtal, as a point of departure, it will be satisfactory to 
know -its geographical position. By a series of ‘observations! with the: ren! 
flecting circle of Troucuton, and algo By his astronomical circular instru 
ment, I found the latitude to be 30 48 98 N: and ‘having been so for=' 
tunate as to get two observations of immersions of the first satellite of | 
Jupiter and one of the second, I am able to give a. wood idea of the 
longitude of the place; and the more satisfactorily, as io of the immer=_ 
sions are compared with those taken at the Madras observatory on_ the 
same night, and pa which I have been favored by Mr. Gopinenam, 
the Metonouiee there. 
Tue telescope used by me in observing the satellites was a Dotonp’s 
forty-two inches achromatic refractor, with an aperture of two and three-~ 
quarter inches and power of about seventy-five applied, having a tall 
stand and rack work for slow motion. The watch was a marine chrono- 
meter, made by Mo.teux of London, and went with the greatest steadi- 
ness on its rate, as nightly determined by the passage over the meridian 
of fixed stars observed with a transit instrument. The time of mean noon 
when: required was always found by equal altitudes. 
Q 
