KNOWLEDGE. 



January, 1915- 



naturally, deri\'es an income from the royalties 

 Since the formation of the company the well- 

 being of the native inhabitants has greatly improved, 

 and the town of ]Mogok has become of greater 

 importance. 



The writer is indebted for information, the native 

 pictures, and some of the photographs to the 

 secretary of the Burma Ruby Mines, Limited, and 

 for five of the photographs to "Sirs. M. L. Milne, of 

 Mogok. 



SOLAR DISTURBANCES DURING NOVEMBER, 1Q14 



By FRANK C. DENNETT. 



Only on one day, November 29th, was it found impossible 

 to make solar observations, and on all but two (16th and 

 17th) of the other days of the month spots were \-isible, 

 and faculae were present on those two, so that the Sun 

 appears to have been never quite free from disturbance. 

 The central meridian at noon on November 1st was 

 174° 56'. 



As No. 36 of the October list remained visible until 

 November 3rd, it reappears on the present chart. 



No. 37. — First seen as a triangle of pores in a faculic 

 cloud some two and a half days within the south-eastern 

 limb on November 3rd, and little changed on the 4th. On 

 the 5th they were nearly in a line, but traces of smaller ones 

 were showing south of the eastern larger spotlet. On the 

 6th there was a spotlet around which clustered five pores, 

 but next day there again appeared a line of pores forming 

 two cur\es, whilst on the 8th, when last seen, there were 

 only two pores ten thousand miles apart. The total length 

 of the group was sixty-eight thousand miles. 



No. 38. — This fine group was first seen on the 7th, lying 

 diagonally in latitude. There were two larger spots, each 

 some ten thousand miles in diameter, with pores between 

 them, the length of the group being forty-nine thousand 

 miles. The dark helium line Dj was easily seen in the 

 spectrum of the group-area. The two spots and their 

 attendants receded from each other until, on the 12th, 

 the disturbance was nearly one hundred thousand miles 

 in length. On the 14th. when last seen, only one spot was 

 visible, with attendant faculae, near the limb. 



No. 39. — Two pores seen on the 13th, three the next day, 

 and one on the 15th when last observed. The length was 

 thii-ty thousand miles. 



No. 40. — Only two pores seen on the 18th. 



No. 41. — First seen as two spots in a faculic disturbance, 

 just well round the limb, on the 18th, with a tongue-shaped 

 prominence on the limb, round which they had come. The 

 eastern spot was the larger on the 20th and 21st, with the 

 inner edge of the penumbra brightest around its two 

 umbrae. On the 24th there were pores in front of the spot, 

 making the disturbance forty-eight thousand miles in 

 length. It was last seen as a pore on the 27th. Its greatest 

 diameter was eight thousand miles. 



No. 4la. — A solitan,- spot first seen on the 21st, next day 

 having a pore twenty-one thousand miles in its rear, and 

 two on the 24th when last seen. 



No. 42. — A pair of spots, the leader being largest, in a 

 faculic area, just round the limb, on the 24th, On the 27th, 

 when last seen, thev were like two moderate pores, seventy 

 thousand miles apart, with a minute point close in front of 

 the eastern one. 



No. 43. — A spot fifteen thousand miles in diameter 

 close within the limb on the 27th. As it advanced across 

 the disc it was seen to have a trail of pores and spotlets, 

 one hundred and nineteen thousand miles in length, stretch- 

 ing diagonally from latitude 21° to 27° south. \Mien last 

 seen, on December 8th, it was apparently a single spot some 

 22° from the limb, with a long faculic trail covering the 

 area of the pores and spots previously observed. 



No. 44. — A spot first seen about tivo days within the 

 limb on November 30th : evanescent pores showed round it. 

 On December 1st and 2nd the umbra appeared double, 

 but on the 3rd the larger umbra was itself delicately bridged 

 and its northern portion red in colour. It was sixteen 

 thousand miles in diameter. By the 5th its appearance 

 had much changed, and more so on the 8th, when a spell of 

 cloudy weather interrupted the observations. 



Faculae were seen near the south-eastern limb on 

 November 2nd, amid which No. 37 afterwards developed ; 

 on the 7th, two at longitude 37°, S. latitude 32°, and 43°, 

 S. 27° ; and on the 27th. The facuHc remains of No. 37 

 were also seen near the south-west on the 12th. A bright 

 ridge at 64°, N. latitude 29° was seen on the 4th and 5th 

 near the north-east limb ; again on the 6th and 7th a 

 knot around 34°, N. 30° ; from the 15th till 17th the 

 great remains of No. 34 from 258° to 285°, N. 23° were 

 observed ; on the 20th, faculae marked the place where 

 No. 41rt afterivards appeared ; and on the 22nd a double 

 disturbance around 196°, N. 23° was seen. On the 17th 

 that seen at 34°, N. 30° was again obser\'ed near the 

 north-west limb; also the remains of Nos. 41 and 41a 

 on the 28th and 30th. 



The chart has been constructed from the combined 

 observations of Mr. John McHarg and the writer. One of 

 our usual helpers, Mr. J. C. Simpson, we deeply regret to 

 say, died on November 28th at the age of seventy-six. 



DAY OF NOVEMBER, 1914. 



