152 Mr. Edward Lovett, Report on the 



made right along the top and bottom of both pictures, so that 

 they both correspond as to amount of foreground and sky. 



(2.) It must be remembered that in printing, the picture taken 

 by the right-hand lens comes on to the left-hand side of the 

 print, and vice versa ; it is therefore necessary to mount them on 

 the reverse sides to that in which they are printed, so that the 

 true relative positions may be retained. This is done by cutting 

 the print, and mounting the pictures taken by the right and left 

 lenses on the right and left sides of the card respectively. 



(3.) The two should then be divided, and the sides trimmed to 

 the proper width, so that the centres shall be about 2f inches 

 apart when mounted, bearing in mind that the picture on the 

 right-hand side should sliow more of the right side, and that on 

 the left-hand side more of the left of the object. 



The author has been accustomed to try the positions in the 

 stereoscope before mounting permanently ; by this means sub- 

 sequent vexation and disappointment is often avoided. The best 

 class of stereographs are printed as transparencies on glass ; but 

 for this purpose it is necessary, unless special appliances are 

 used, to cut the negative so as to reverse the pictures, but the 

 superiority of the result well repays for the extra trouble involved. 



Should any member of the Club want further information, 

 I shall be pleased if he will write to or call upon me, and I will 

 help him to the best of my ability. 



68. — Eepobt on the New Well at Addington. 



By Edward Lovett. 



(Eead May 9th, 1888.) 



The site of this well is in a valley about three-quarters of a 

 mile south-by-west of Addington Church, near Hares Bank. 

 In sinking the well the Corporation of Croydon sought to obtain 

 a supply of water from the Chalk in a drainage area outside that 

 containing the old wells. The well was commenced on the 29th 

 of January, 1885. The surface of the ground at its mouth is 

 318 ft. above mean sea-level ; and the area of the gathering 

 ground of the water supplying the well has been estimated at 

 about eleven square miles. In the Chalk formation subterranean 

 water generally travels along fissures which are often found 

 under the valleys, although instances occur in which this does 

 not happen ; for example, water from Merstham Valley flows 

 under high ground towards the Carshalton Springs. The well, 

 is circular, 10 ft. in diameter, and 200 ft. deep. It is lined with 

 brickwork to a depth of 51J ft. from the top, but below there is 



