384 Capt. Kater’s experiments for determining the variation 
Of the Latitudes and Longitudes of the different Stations . 
The daily rate of Mr. Browne’s chronometer before I left 
London, was — o ! ,2 the chronometer being too slow for 
Greenwich time on the 15th June i m .i5*,75; but this rate, as 
might have been expected, varied from the motion of the 
waggon or other causes, so that at Unst, its mean rate was 
— -i%32, at Portsoy — i s ,7, and at Leith — 2', 42, which rates 
are deduced from the column headed “ chronometer/’ in the 
table of transits given in the Appendix. 
The meridian of my station at Leith Fort, passed within 40 
feet of that of the observatory on the Calton Hill, the longi- 
tude of which Mr. Jardine, who has the care of the observa- 
tory, informed me, is i2 m .46%7 west of Greenwich, which 
may also be considered as the longitude of my station. At 
Leith Fort, on the 17th September, by two sets of altitudes 
of the sun, taken with the repeating circle and given in the 
Appendix, the chronometer was found to be 8 m .4i*,6 too fast, 
and as it was slow at Greenwich on the 15th June i m .i5,75, 
it had lost between that period and the 17th September, 
2 ”*49%35> which is at the rate of i*,8 daily. 
At Unst, by four series of altitudes of the sun, taken on the 
22d July with the repeating circle, (which I conceive it is un- 
necessary to detail, as the results differed very little from 
each other) the chronometer appeared to be 50 s , 2 fast, to 
which i°. 13 s , 75 being added, and also 1 m .6',6 (the loss of the 
chronometer in 37 days) we obtain 3“. 12 s . 55 for the longitude 
of Unst in time, west of Greenwich. 
Agaitio Taking Leith for the point of departure, we have 
the chronometer fast on the 17th September 8 m .4i s ,6, and at 
