184 PHILOSOPHICAL TRANSACTIONS. [ANNO 1797. 



— 28 m 21 s in time of ra, and — 14' 55" in pd. In the place where it is marked 

 in Atlas, according to the erroneous catalogue, is no star ; but very unaccountably 

 it is also marked in its right place in the same atlas. Flamsteed has 4 complete 

 observations of it on page 167, 445, 477> and 478. Mr. Wollaston, not being 

 acquainted with the existence of 21 Coronae in its right place, supposes, zone 55°, 

 that I have made a mistake in calling my double star vi. 18, very unequal ; but in 

 his corrections he gives the place of a star, as he calls it " near v," which is the real 

 second v of Flamsteed ; who very particularly describes it on page 167, " Duarum 

 ad v sequens et clarior ;" and this is the double star I have given in my catalogue 

 as 21 Coronae. 



Notes to Navis. — 1 : there is no observation of this star ; but in Miss Herschel's 

 manuscript catalogue N° 92 is a star 2° more south, which has probably been cal- 

 culated wrong, and has given occasion for its insertion ; correcting therefore the 

 pd of 1 Navis -j- 2°, the expression of its brightness is as I have given it. — 17 : there 

 is no observation of this star ; but if we correct the pd -+- 3°, it will then agree with 

 N° 238 in Miss Herschel's manuscript catalogue. — 21, by Flamsteed's observation 

 page 431, the pd of the British catalogue requires + 18'. 



Notes to Orion. — 12: Flamsteed never observed this star. It does not appear 

 how it came to be inserted in the British catalogue. — 26 : Flamsteed never observed 

 this star. An error of 20' in pd in the calculatiou of one of the 4 observations of 

 25 Orionis, may have occasioned the insertion of it. — 35 is marked : : in the Bri- 

 tish catalogue ; but Flamsteed has 7 complete observations of this star ; therefore 

 the marks : : should be out. — 63 : There is no observation of this star ; but sup- 

 posing an error of + 2 m 14 s of time in ra, and of -f O' 22" in pd, it will then 

 agree with N° 33 of Miss Herschel's manuscript catalogue. I have taken the 

 comparative brightness of that star, supposing it to be 63. — 64 and 65 have no 

 observation by Flamsteed ; but their insertion has been accounted for by Mr. Bode 

 in his Jahr-Buch for 1793, page 195. He mentions Flamsteed's 2 observations 

 on page 17 and 94. There is a 3d on page 292, which confirms what Mr. Bode 

 says. The 64 of which I give the brightness, is not far from the place assigned 

 to it in the British catalogue. It is N° 1 in Miss Herschel's manuscript catalogue. 

 — 76 : There is no observation of this star. A mistake of 41" in pd in calculating 

 one of the 4 observations of 8 Monocreotis, might occasion its insertion. 



XIV. An Account of the Means employed to obtain an Overflowing Well. By 



Mr. Benjamin Vulliamy. p. 325. 



In beginning to sink this well, which has a diameter of 4 feet, the land springs 

 were stopped out in the usual way, and the well was sunk and steined to the bottom. 

 When the workmen had got to the depth of 236 feet, the water was judged not to 

 be very far oft', and it was not thought safe to sink any deeper. A double thick- 

 ness of steining was made about 6 feet from the bottom upwards, and a borer of 

 51 inches diameter was used. A copper pipe of the same diameter with the borer 



