th the Omvty of Norfolk. 333 



Jntthods, vet these obrtervaiions differ considerably from 

 one another. In one instance this diffcrenre aniounls io 

 42 seconds ; and it niav be expected that such differences 

 wiil hiquenily happen, for the air may be more tavonrabie 

 lor observation at one place, than it may t)e at the other. 



But the greatest difference in the results derived frOiTi the 

 chronometers is only Oi'^.G ; and if this difference were 

 llirovvn out of the computation, the remainina five obser- 

 vations would give the longitude as before, within tiva- 

 tenths o\ a second. 



In August 17S5, Mr. Wil'iani Wales, of Christ's Hos- 

 pital, and Mr. George Gilpin, of Somerset House in the 

 Strand, paid a visit to their friends in Nrirfolk, and, as they 

 passed through Lynn, called on me to know the time here. 

 On their return to London, Mr Wales favoured me with 

 the result of the astronomical observations whic h he had 

 made in Norfolk. As he has settled the latitude and longi- 

 tude of a point of land, interesting to the geoeraohv of 

 this county, 1 If ok upon this part of his connnunication 

 of too much value to be lost. I have, therefore, extracted 

 the foliowmg article from his letter. 



" Christ's Hospital. Lor.don, Sept. 2, 1S05. 



** I found that no part of the county of Norfolk lies to 

 the nofthvvard of the latitude of 53°. I could not deter- 

 mine whether the bluff" point called Scoli Head, or Holm 

 Point, te the most northerly point of Norfolk. In- 

 deed, I find it is a disputed point amongst those who have 

 had n)anv opportunities of trying. 



" A Mr Hendry, of Brancaster, an old coaster, and who 

 has set these points often when one came open of the 

 other, says that Scolt Head forms the most northerly point 

 at high, and Holm Point at low water, as the tide ebbs 

 out further at Holm Point than it does at Scolt. Now, I 

 had six tolerably good observations for the latitude of Scolt 

 Head ; and pronounce it to he in latitude 5-2^-' 59' 31|" N. 

 and longitude by my watches 0^ 44' 1 1" E, of Greenwich, 

 *' I am, sir, with great estee-.Ti, &c. 



" Wm. Wales." 



Mr. Wales had two chronometers with him on his Nor- 

 folk tour, which he compared at Somerset House,' both 

 iK-tore he set out and after his return. The longitude of 

 I..ynn, by one ot his chronometfrs, was l' 35", I in time 

 E. of Greenwich; by the other l' 40",4 In this deter- 

 mination he supposed Somerset liouse, in the Strand, 

 London, to lie 1 7" west of the Royal Observatory. The 



chro- 



