DEFLECTION OF LIGHT—DYSON AND OTHERS. 157 
for a certain amount of virgin forest, the island is covered with 
coco plantations. The climate is very moist, but not unhealthy. 
The vegetation is luxuriant, and the scenery is extremely beautiful. 
We arrived near the end of the rainy season, but the gravana, a dry 
wind, set in about May 10, and from then onwards no rain fell ex- 
cept on the morning of the eclipse. 
We were advised that the prospects of clear sky at the end of May 
were not very good, but that the best chance was on the north and 
west of the island. After inspecting two other sites on the property 
of the Sociedade d’Agricultura Colonial, we fixed on Roca Sundy, 
the headquarters of Sr. Carneiro’s chief plantation. We were Sr. 
Carneiro’s guests during our whole visit, and used freely his ample 
resources of labor and material at Sundy. We learned later that he 
had postponed a visit to Europe in order to entertain us. We were 
also greatly indebted to his manager at Sundy, Sr. Atalaya, with 
whom we lived for five weeks; his help and attention were invaluable. 
Mr. Wright and Mr. Lewis of the cable station kindly assisted us 
as interpreters when necessary. 
Sundy is situated in the northwest of the island overlooking the 
sea at a height of 500 feet, and as far as possible from the cloud- 
gathering peaks. Our telescope was erected in a small walled in- 
closure adjoining the house, from which the ground sloped steeply 
down to the sea in the direction of the sun at eclipse. On the other 
side it was sheltered by a building. The approximate position was 
latitude 1° 40’ N., longitude 29m. 32s. E. 
28. The baggage was brought to Sundy on April 28 mainly by 
tram, but with a break of about a kilometer, where it had to be 
transported through the woods by native carriers. After a week 
spent on the preparations, we returned to San Antonio for the week 
May 6-13, as it was undesirable to unpack the mirror so early in 
the damp climate. On our return to Sundy the installation and 
adjustments were soon completed, and the first check plates were 
taken on May 16. Meanwhile the gravana had begun, which, al- 
though there is no rain, is generally accompanied by increased clouds. 
There were, however, some days of clear sky, and the nights were 
usually clear. 
The ceelostat was mounted on a stone pier built for the purpose. 
The clock weight fell into a pit below the clock deep enough to 
allow a run of 36 minutes without rewinding. Care was taken to 
use a particular part of the ccelostat sector, considered to be the 
most perfect, in photographing the eclipse and the check field. The 
telescope (Oxford astrographic object glass, see p. 137) rested on 
wooden Vs near the two ends, the Vs bemg supported on packing 
cases; the one at the breech end could be moved laterally to allow 
