184 , Captain Sabine’s experiments to determine the 
perature being very regular and satisfactory ; a thermometer 
suspended in the marquee on a level with the dial plates of 
the clocks, rarely differing more than one or two degrees at 
farthest from those within the cases. 
In the following tables, [A. B. C.] an account is given of the 
going of the clocks from the 20th of June to the 14th of July, 
when it was conceived that a sufficient number of results had 
been obtained, exclusive of those before the foundation had 
settled, which are omitted. 
The times of transit were noted by a very steady going 
chronometer, No. 259 of Messrs. Parkinson and Frodsham. 
The distance being small between the tent and the observa- 
tory, the chronometer could be carried from one to the other, 
without inconvenience, as often as was required, by which 
means the comparison of intermediate watches was avoided. 
The mark to which the transit instrument was adjusted 
previously to every observation, was about three hundred 
yards distant, being as far as could be distinctly seen at all 
times ; other marks were fixed in the prolongation of the 
same line at distances of one and a half, and three miles, by 
which the position of the first was occasionally verified. 
The clocks were compared with No. 259, 
1st. At every revolution of twelve hours by the chronome- 
ter, the daily rate of which was less than two seconds ; the 
time of comparison was, whenever No. 259 showed seven 
hours, or more precisely of clock 1, one minute before, and of 
clock 2, one minute after seven hours ; the sun’s transit hav- 
