202 
Mr. Fisher on the errors in longitude 
Kendal and Arnold. Mr. Lyons, who arco ipanied him, 
landed at Sheerness Fort, and found the longitude tr them 
to be 30 'o" E, which is about 13' W of the true longitude, as 
determined in the Trigonometrical Survey. 
The same occurrence took place last summer (1819). The 
longitude of a place in one of the Orkney Islands, as deter- 
mined by three chronometers made by Arnold, two of them 
belonging to myself, the other to Lieut. E. Home, R. N. who 
accompanied me, was £>'40" W. of the longitude determined 
by the difference of iR of stars E and W of > . 
Again, in the trial of Mr. Harrison's timekeeper, in 1764, 
the longitude of Barbadoes by the watch was lo' 45" more to 
the westward than that determined by astronomical observa- 
tions made by the persons sent out for that purpose. 
Soon after this trial, the commissioners of longitude agreed 
with Mr. Kendal, one of the watchmakers appointed by 
them to receive Mr. Harrison’s discoveries, to make another 
watch on the same construction, which went considerably 
better than Mr. Harrison’s. Mr. Kendal’s watch was sent 
out with Captain Cook in his second voyage towards the South 
Pole and round the world, in the years 177 2 ’ 3~4 an d 5, 
“ when the only fault found in the watch was, that its rate of 
“ going was continually accelerated.” 
It now remains, therefore, to determine what this accele- 
ration arises from. That it does not arise from the motion 
of the vessels, is evident in the case of the nine chronometers 
on board the Dorothea and Trent ; since the acceleration was 
observed when the ships were firmly beset with ice; also in 
the case of the alteration in the rates of the chronometers upon 
