TOTAL SOLAR ECLIPSE OP AUGUST 9, 1896. 
11 
The method of working the instrument was that adopted by Mr. Fowler in 1893. 
He himself being stationed at the camera, 2nd Class Petty Officer G. M. Roberts 
made the exposures by withdrawing a card from the front of the prism, while 
Sub-Lieutenant Beal made careful records of the times at which each plate was 
exposed, and warned Mr. Fowler of the termination of the three long exposures. 
Privates J. Briggs and F. Huskisson stood one on each side and respectively 
handed the slides to and received them from Mr. Fowler. 
Fig. 1. 
The 6-iiich Hut, .sliowiiig Mi’. Fowler and liis Assistants at drill. 
Actual rehearsals with the splendid assistance thus available showed that the 
programme could be thoroughly carried out 5 in fact a few seconds weie saxed, so 
that the attempt to secure a photograph exactly at the end of totality was the more 
likely to be successful. 
The 9-inch Prismatic Camera. 
This instrument was intrusted to Dr. W. J. S. Lockyer. 
The tube carrying the prism, lens, and camera of the 9-inch prismatic camera was 
fixed horizontally on loaded packing cases resting on concrete foundations, and the 
sun’s rays were reflected into it by the mirror of a 12-inch siderostat. Three dark 
slides, each holding three plates, were provided, the change from one plate to the 
next in each slide being made by a rack and pinion. An additional slide, carrying a 
plate 81" X 6|", was so arranged that the light passing through a narrow slit 
running the whole length of the spectrum was exposed at any instant. The position 
