Total Eclipse of the Sun, 1901, May is. 261 



the Observatory photoheliograph, both the photographs which he took 

 of the corona during totality and the above photographs of the partial 

 phase. The former I myself brought home to the Royal Observatory, 

 Greenwich ; the latter will be sent at the first available opportunity. 



I took no observations myself of temperature during the eclipse, the 

 Director of the Royal Alfred Observatory having made arrangements 

 for full meteorological observations being taken both at the Obser- 

 vatory and at several other stations, not only in Mauritius, but also on 

 other islands in the Indian Ocean. 



" Preliminary Note on Observations of the Total Solar Eclipse of 

 1901 May 18, made at Pamplemousses, Mauritius." By 

 (Mrs.) A. S. D. MAUNDER. Received October 23, Read at 

 Joint Meeting of the Royal and Royal Astronomical Societies, 

 October 31, 1901. 



Having observed successfully the eclipses of 1898 January 22, in 

 India, and 1900 May 28, in Algiers, and my husband having been 

 sent to Mauritius as the representative of the Royal Observatory, 

 Greenwich, to observe the eclipse of May 18 last, I determined to 

 accompany him, and to take with me the instruments which we had used 

 in 1900. By the great kindness of Mr. G. J. Newbegin, F.R.A.S., I 

 was also furnished with a 4|-inch Cooke photo-visual telescope of 

 71 inches focus. 



As my husband fixed his observing station at the Royal Alfred 

 Observatory, Pamplemousses, and as the Director, Mr. Claxton, gave 

 me every facility, I set up my instruments in the Observatory grounds. 

 The Newbegin telescope was mounted upon the equatorial stand of the 

 photoheliograph which was left vacant, the Mauritius photoheliograph 

 having been dismounted in order that it might be used in connection 

 with the 16-inch ccelostat of the official Greenwich Expedition. The 

 photoheliograph dome stands on the east of the Observatory grounds, 

 and about 150 feet to the west of the dome I set up the Waters equa- 

 torial lent to my husband by the Royal Astronomical Society, which I 

 used to carry two little cameras, each with a 1^-inch Dallmeyer 

 Stigmatic lens. About 105 feet further west the camera belonging to 

 the Waters telescope was firmly fixed, pointing directly to the Sun, 

 and by its side the Niblett lens belonging to the British Astronomical 

 Association, a photographic lens 4 inches in diameter, and of 34 inches 

 focus. This was likewise fixed rigidly. Mr. Nevil Maskelyne, F.R.A.S., 

 also lent me his kinematograph, and this was mounted a few feet 

 further south. The management of these instruments during the 

 eclipse was very kindly undertaken by several friends, and I was 



T 2 



