4 PROFESSOR J. RORMAN LOCKYER ON THE 
29" 46' 10" E., so that it was a little less than five miles south-east of the nearest 
part of the central line of eclipse. 
Local Conditions of Ecli'pse. 
The apparent semi-diameters of the sun and moon at the time of eclipse were 
respectively 15' 48‘4" and 16' 17’8", while the duration of totality was 105 seconds. 
Assuming the chromosphere to be 10" deep, a portion of it would thus be visible for 
18 seconds after the commencement of totality, and another portion for 18 seconds 
before the end of totality. 
The sun’s altitude at the time of totality was a little over 14°, and its amplitude 
about 7° N. of E. 
The calculated Greenwich time of the commencement of the total eclipse was 
August 8d. 15]i. 57m. 42s. First contact took place at the approximate position angle 
70° west of the north point, and the last at 111° east of the north point. 
Erection of Huts and Instruments. 
To secure proper foundations for each of the instruments, the surface peat was 
removed, and concrete bases laid down on the solid rock. The wood framing for 
the huts had been brought out from England, each piece carefully marked so that no 
time was lost in erecting them. The large hut for the 6-inch prismatic camera, as 
well as that for the siderostat, were almost completed and covered with ATillesden 
canvas at the end of the first day, owing to the zeal of the chief carpenter, 
Mr. Martin, and his assistants. 
July 28th, like the preceding day, was fortunately fine, and the huts were then com¬ 
pleted and made to safely withstand the violent wind experienced. 'The photographic 
dark-room was also finished. 
The following two days were wet and cold, but the huts being erected, it was 
possible to continue the erection and adjustments of the instruments, unpack and 
attend to various small matters. A tent, consisting of spars and sail cloth, was also 
fitted up as a shelter for the large integrating spectroscope. 
During the next few days all the instruments brought from England by the 
“ Volage ’’ were completely mounted, and by the time of my arrival on August 2nd, 
they were in adjustment and ready for the eclipse. 
The remaining instruments which 1 took out with me on the s.s. “ Garonne " were 
also put In position without delay, so that almost a whole week was available for 
rehearsals and general training of those members of the ship’s company who volun¬ 
teered their assistance. 
Trial photographs with all three instruments, taken on August 6th, at the same 
