VOL. LXXXV.] PHILOSOPHICAL TRANSACTIONS. 633 



for the staff to be seen distinctly, when the star came to its greatest elongation 

 in the day-time, if the sun shone out. We therefore left Beachy Head, and 

 proceeded to the following stations, viz. Fairlight Down, Brightling, Crow- 

 borough Beacon, and Botley Hill; from which latter place we returned in 

 June to Beachy Head, and observed the direction of the meridian. From 

 this station, the party went to Dean Hill, and thence to Salisbury Plain, for 

 the purpose of fixing on the extremities of the new base. This being done, 

 the instrument was taken to Old Sarum, Four Mile Stone, Beacon Hill, 

 Thorny Down, and Highclere, where the operations of this year terminated. 

 But it must be observed, that owing to a strain which the clamp of the 

 instrument sustained when at Thorney Down, no dependance could be 

 placed on the observations which were made at Highclere. On this being 

 discovered, and the season too far advanced to permit of any business being 

 done after the instrument might be repaired, the party returned to London. 

 After this are set down the angles that were taken this year 1793. And then 

 the business of 1794 commences. 



The party this year (1794) took the field the 4th of March, and proceeded 

 from London to the Isle of Furbeck, taking Butser Hill in its way. In the 

 observations of the year 1792, the angle at that station, between Rook's Hill 

 and Dean Hill, is noted to be dubious. The reason which induced us to be of 

 that opinion was, that the telescope, by some accident, was thought to have 

 been moved after the observation of the light, and just at the time when the 

 angle was about to be read off. As the season was then far advanced, and 4 

 lights had been fired, without seeing more than one of them, it was determined 

 to leave the final observation of that angle till this year. Accordingly on our 

 arrival at Butser Hill this 2d time, a lamp was sent to each of the stations, and 

 the angle repeatedly taken. The party then proceeded to Nine Barrow Down in 

 the Island of Purbeck. 



As it will answer our purpose better, to give an account of the stations which 

 were chosen this year, for the further prosecution of the survey, in another part 

 of this work; it remains only to be observed, that from Nine Barrow Down the 

 instrument was taken to Black Down, near Dorchester, and thence to Win- 

 green, Highclere, and Beacon Hill; the observations which were made this 

 year being concluded at the latter place in the beginning of June. It may how- 

 ever be mentioned, that in addition to the interior stations chosen in the year 

 1792, for the future use of the small instrument, 3 others were selected in this 

 and the preceding season, namely, Ramsden Hill, near Christchurch; Thorness 

 in the Isle of Wight; and Stockbridge Hill. The quantities of the angles 

 taken in this year (1794) are then registered. 



The situations of the stations are then described: viz. Hanger Hill station is 



VOL. XVII. 4 M 



