XXXIV 
APPENDIX. 
coast, made by Captain Parry in the spring of 1820, whereby its bearing and 
distance from the station in which the Hecla wintered being ascertained, the 
difference of meridians was found equal to 11' 16".5 of longitude. 
By the lunar observations contained in the following pages, the meridian 
of the Hecla’ s station was determined 110° 48' 29". 2, whence the longitude 
of the point of land is deduced by lunar observation 110° 37' 12".7. 
Assuming, therefore, that the result of so great a number of lunar obser- 
vations was the true longitude, the rates which, on the 6th of September, had 
been continued through a period of four months, are chargeable with an error 
amounting on that day to 3' 13". 7. being in distance rather less than 9-10ths 
of a geographical mile. 
On the further presumption, that this amount had obtained gradually, which 
is usual and reasonable to suppose, it may be considered as the maximum of 
error, dependant on the going, or on the rates, of the chronometers, to which 
the longitudes determined by them, between the 6th of May and the 6th of 
September, are liable to be suspected. 
Note. — In transcribing for the press Table III. of the Account of the Going 
of the Chronometers, an accidental error has been made in the rate of No. 253, 
between the 10th and 17th of June, which was not discovered until the sheet 
had passed through the press ; it should have been 25 s .9 instead of 8 3 .7 per 
diem; the change which took place at that time in the rate of No. 259, 
occasioned its not being included amongst the chrononometers by which the 
longitudes of 1819 were determined ; the watch was quite new, and the 
probability of a considerable change of rate, before it should finally settle, 
had been anticipated by its makers ; and it may be remarked, that it steadily 
maintained the rate then taken up, throughout the remainder of the voyage. 
It is satisfactory to be enabled to add, that the three excellent chronometers 
which Messrs. Parkinson and Frodsham sent on trial, will again be employed 
on the Expedition which is now fitting ; No. 259 having been presented by 
the officers of the Hecla and Griper to Captain Parry, and Nos. 253 and 254 
havingbeen purchased by the Admiralty. 
It is difficult to appreciate too highly the value of chronometers, which 
have already borne a trial in a climate, and in circumstances so peculiarly 
unfavourable. 
The purchase is the more satisfactory, when viewed as an encouragement 
on the part of Government, which Messrs. Parkinson and Frodsham have so 
justly merited. 
