S80 
Lieut. Mudge on the Rates of Chronometers. 
TABLE of the Land and Sea Rates of the Chronometers, supplied to 
his Majesty’s Ship Leven, in her Voyage to the Cape de herd 
Islands, during the years 1820 and 1821. 
Particulars of the Times, Places, &c. 
N° 1970, 
Arnold 
Rate. 
N° 493, 
Arnold 
Rate. 
N° 249, 
Harris 
and 
Hatton 
Rate. 
N° 503, 
Arnold 
Rate. 
n 
it 
// 
// 
LR By maker, April 8 
1820. 
g 
5.00 
£ 
3.00 
or 
& 
9.60 
£ 
7.00 
SR * Portsmouth, from Ap. 8. to May 3. 
£ 
1.29 
g 
1.85 
g 
9.08 
g 
5.83 
LR -J* Portsmouth, 
May 3. to May 6. 
g 
3.80 
g 
3.24 
g 
9.50 
g 
7.80 
SR St Vincent, 
July 28. to Aug. 8. 
- 
- 
g 
0.81 
g 
7.50 
g 
6.70 
LR Madeira, 
Sept, 2. to Sept. 15. 
1 
0.8 
g 
0.80 
g 
3.80 
g 
8.5 
LR Do. 
Sept. 23. to Oct. 7. 
l 
0.9 
g 
0.60 
£ 
3.50 
g 
3.50 
SR Teneriffe, 
Oct. 7. to Oct. 17. 
l 
0.82 
- 
- 
g 
6.27 
g 
9.89 
SR Do. 
Oct. 17. to Nov. 1. 
l 
2.66 
g 
0.60 
O’ 
2.86 
£ 
7.40 
SR Mouth of the Ouro, 
Nov. 20. to Nov. 29, 
l 
0.92 
i 
0.26 
£ 
3.77 
£ 
9.19 
SR Quail Island, 
Dec. 22. to Dec. 27. 
l 
0.90 
g 
1.02 
g 
6.42 
g 
11.22 
SR Island of Sal, Feb. 
7. 1821. to Feb. 12. 
g 
0.68 
£ 
1.58 
g 
7.38 
g 
12.80 
SR Quail Island, 
Feb. 21. to Feb, 27. 
or 
0.58 
£ 
2.50 
g 
7.83 
£ 
12.83 
SR Goree, 
Mar. 5. to Mar. 17. 
g 
0.15 
£ 
2,18 
g 
6.91 
g 
12.41 
SR Quail Island, 
Mar. 27. to Apr. 14«. 
£ 
0.41 
g 
1.75 
g 
7.30 
g 
11.83 
SR St Vincent, 
April 29. to May 13. 
g 
0.21 
or 
fc 
1.80 
£ 
7.51 
g 
13.87 
The rates in this voyage are certainly not so great as in the 
preceding, and consequently we cannot draw from them the 
same satisfactory conclusions between the sea and land rates ; 
although the first four lines indicate very clearly that a change 
had taken place ; but the amount is not so well defined. 
In the former voyage, the watches went remarkably well, and 
the distinction between the two rates is well defined and satis- 
factory. 
* These sea rates were found by comparison of times, April 8, as delivered 
by the makers ; and the mean Greenwich time by the Observatory clock at Ports- 
mouth, May 3. 
t These rates were determined by Dr Inman at the Portsmouth Observatory. 
