106 



THE INDIAN ECLIPSE, I 



Mr. Sidney Waters, F.R.A.S., had bequeathed to them. I had 

 seen this instrument at Vadso, where Mr. Waters, who had 

 designed it for eclipse observation, had taken it in August 1896, 

 and knew it to be convenient and portable. This placed a 

 second camera at my disposal. The lens was a portrait com- 

 bination of 2^ in. aperture, used in conjunction with a Dallmeyer 

 telephoto-lens, and then having an equivalent focal length of 

 8 ft. I mounted my stigmatic lens camera instead of the 

 counterpoise of the Waters equatorial, and was enabled to use 



THE LATE MR. SIDNEY WATERS, F.R.A.S., AT VADSO. 



both instruments through the very kind assistance of Captain 

 P. B. Molesworth, E.E., who worked the Waters camera whilst 

 I was employed on the smaller one. 



My plan was to take two similar series of six photographs 

 each, the exposures being graduated so as to make the equivalent 

 exposures very nearly a geometrical series of 1 to 1800, the 

 ratio being about 4^. In other words, the actual exposures 

 with each instrument were in the following order : 1, 5, 20, 

 20, 5, and 1 seconds. The full aperture was not used with the 

 Waters lens, better definition being obtained when the lens 

 was stopped down to If in. The exposures began at the 



