— 235 — 
Annular eclipse of the Sun of March 17, 1904. 
Course of central line: Indian-Ocean, Sabang, Siam, North 
of Luzon. 
Sabang. 
Contact-times for Sabang (p=5" 53’ N, à= 95° 18’ E). 
I. 10% 4" 26° a. Mean local time. 
iL]. u RD 
DE 345 «M 
IV. ENS 
Max. Phase 0 4 28 ,, Altitude sun 83°. 
Half diameter of the sun 16' 4."1 
ww Mon ID A. 1. 
Obscurated yari of the sun's disc in maximo 0.877. 
Declination. 
The instruments at my disposal at Sabang allowed only 
to observe either the variations of H or of D. 
The difficulty of being certain as to the exact temperature 
of the magnet in the open air during an eclipse, and the 
more quiet character of the declination in comparison with H, 
made it advisable to choose D as the element to be observed. 
_ I made use of the reading of the small magnet for deflection- 
observations of the ELLIOT-theodolite. 
In the field of the telescope is seen the image of the 
ivory scale reflected by the mirror attached to the magnet. 
Each division of the ivory scale represents one minute; 
tenths of minutes may be estimated. 
During the first hours the readings were taken by an 
assistant, being myself occupied with electrical and astro- 
nomical !) observations, but from 1" 35" I observed myself. 
The readings follow hereafter: 
D Th 
e observation of = moment of contact failed for each of the four 
contacts by floating cumuli clouds. 
