562 
MR. J. NORMAN LOCKYER ON THE 
of the phenomena appearing at one of the cusps in the photographs taken shortly 
after the end of totality. 
Showing position of sun’s axis and equator, April 16, 1893. 
Fig. 3 shows the position of the sun’s poles and equator in relation to the direction 
of dispersion. 
The Dark Slides Used. 
The construction of the camera and dark slides, or plate-holders, was based on the 
plan devised and adopted by Professor Lockyer for the large pictures of the corona, 
which he hoped to obtain in the West Indies in 1886. Fig. 4 will make them 
readily understood. The slides are about 13 inches in length by 7 inches broad, and 
have 3 compartments, each taking a plate 6 inches by 4 inches. 
Eig. 4. 
Details of dark slide employed in West Africa. 
The camera at the end of the long wooden tube has an opening 6 inches square, 
and a rectangular frame 24 inches long, with a central aperture 6 inches by 4 inches, 
and provided with grooves to take the slides, was symmetrically attached to it. A 
dark slide being placed in the frame, so that the first compartment was opposite the 
