— 221 — 
Total Eclipse of the Sun of April 6, 1875. 
Course of central line: Nicobars, Bangkok, North of Luzon 
(nearly parallel to that of the corresponding eclipse of March 
17, 1901). Minimum distance from Batavia + 20°, from Zi- 
Ka-Wei + 10°. Maximum phase at Batavia + 2h 54" p, at 
Zi-Ka-Wei + 4h 15" p. 
Available are hourly eye-readings of D at Batavia and 
half hourly ones at Zi-Ka- Wei, 
Batavia. 
The normal curve has been constructed after the average 
hourly values on the following days, which were magnetically 
quiet at St. Petersburg: March 18, 24, 25, 27 and April 3, 20, 
22, 30. 
E. D. — 1° 50 + 
Hour. April 6. Normal. Hour. April 6. Normal. 
8 a 3.54 4.05 3 p 5.49 5.85 
9 3.33 3.97 E 5.49 5. 56 
10 9. 97 4. 48 5 5. 49 5.34 
11 4.41 5. 20 6 5. 49 5. 13 
12 4. 69 5. 70 7 5. 34 4.91 
Ip 5.34 6. 06 8 5.27 4. 77 
2 4.17 5. 92 9 5.05 5. 69 
The curve of April 6 (see the plate) seems to be rather 
normal till 1^ p, also the evening maximum is reached in a 
normal way, abnormalities occurring betweenwhiles, but it is 
rather difficult to associate them with the eclipse. Perhaps 
the westerly deviation during the first half of the eclipse, 
resulting from the abnormal value at 2^ p. may be ascribed 
to eclipse-effect. 
Zi-Ka-Wei. 
The curve for Zi-Ka-Wei does not show the abnormality 
just mentioned, nor does it exhibit any other features pointing 
to an eclipse-effect. 
