250 Mr. E. W. Maunder. 



aperture and 32 inches focal length. These two instruments were 

 placed horizontally, the camera of the R.R. lens being placed imme- 

 diately above the photoheliograph tube, and both were supplied with 

 light by means of a 16-inch mirror mounted on a coelostat. The 

 second division consisted of the Greenwich coronagraph, and Mr. Ever- 

 shed's prismatic camera. The coronagraph was mounted in a hori- 

 zontal position, and the prismatic camera was fixed immediately above 

 it, both instruments being supplied with light by a 12-inch mirror 

 mounted on a coelostat. Between the two a clock was mounted which 

 rang an electric bell close to the camera end of the photoheliograph, 

 and another close to the 12-inch coelostat, at every tenth second during 

 totality. The instruments were fixed upon boxes filled with stones, 

 and to shelter them skeleton huts were formed, each consisting of 

 three pairs of poles carrying a ridge-pole. Tarpaulins were then 

 thrown over the ridge-pole, and pegged down to the ground. When 

 any instrument needed to be used, one or more of the tarpaulins could 

 be thrown up on the side upon which it was desired to observe. During 

 the eclipse all the tarpaulins were entirely removed, except one fixed 

 round the 10-second clock, which was left in order to shelter the 

 pendulum from the wind. 



The positions of the instruments relative to the Observatory 

 buildings are shown in the accompanying plan, in which are also 

 indicated the positions of Mrs. Maunder's instruments, which were 

 also set up in the Observatory grounds. 



The above arrangement of the instruments was finally completed by 

 May 11 when the prismatic camera was mounted, one week before 

 the eclipse. 



Personnel. The following list gives the names of those who took 

 part in the observations: 



With the 16-inch coelostat and its telescopes 



T. F. Claxton Mauritius photoheliograph. Large-scale photo- 

 graphs of inner corona. 



Bombardier A. J. Cox Recorder to Mr. Claxton. 



Bombardier C. A. Truman Carried plate-holders for Mr. Claxton 

 to and from dark-room during the partial phase. 



Charles G. Garrioch Changed the plates in the plate-holders 

 during the partial phase. 



T. A. Pope Rapid rectilinear lens. Small-scale photographs to 

 show extension. 



E. G. Rowden Exposed at the object-glasses of both the photo- 

 heliograph and the R.R. lens for Mr. Claxton and Mr. Pope. 



With the 12-inch coelostat and its telescopes : 



E. Walter Maunder Greenwich coronagraph. Large scale 

 photographs of corona. 



