286 



REPORT 1872. 



almost up to it. The sector h did not appear to be equally bright, but 

 seemed to consist of light-streaks directed towards spot No. 4 (see fig. 15, 

 p. 285). The most interesting feature observed this evening was a project- 

 ing arm from the west end of a, apparently a continuation of Webb's elbow 

 across the end of a. Mr. Elger speaks of it as very plain, and occupying u 

 position a little east of the curved streak c, which is far from being con- 

 stant in its ajjpearance, even if it should have a permanent character. 

 On this ray or projection I made the following remark when I received 

 the information : — " It appears to be a lateral translation towards the east 

 of c, the portion of the curved streak west of spot No. 16, nearly in a line 

 with GledhiU's d ; " and I further said, " this has much the direction but not 

 the 2'>osition of Elger's h in the tinted plate of the ' Student,' April 1870, 

 p. 161." Mr. Gledhill writes the same evening : — " AU streaks are very 

 bright, y narrow and sharj), r) not well seen far from the border, Webb's 

 elbow conspicuous." 



1870, May 13. — On this day Mr. Pratt saw no less than 42 objects on 

 the floor of Plato, 26 spots and 16 streaks. The stem of the trident was 

 well seen, also the streak »/ as a fan or tongue. For Mr. Pratt's remarks on 

 the streaks, see Report British Association, 1871, pp. 88-91. On the same 

 evening, May 1.3, Mr. Elger recorded the streak y as very bright ; jj and /3 

 faint, r) the faintest on the east side of the floor ; the three arms of the tri- 

 dent faint ; a bright and well defined ; c (the projection from Webb's elbow) 

 nearly as bright as at last lunation, very bright at the position of spot 

 No. 19 ; sector very bright and well defined, a dark zone between its base 

 and the border of Plato. [This dark zone is very unusual.] 



1870, January 15. — At 6*^ Mr. Gledhill recorded "all streaks bright;" 

 the brightest were a and /3 ; all others (y, I, t], 4 ) were seen well ; y, which 

 was seen as a narrow sharp bright streak, not broader than spot No. 17, 

 cut II E'/'2 a very little south of its middle point. The bright elbow (i) on 

 the N.W. floor, at foot of slope of wall, was well seen. At 10** Webb's 



Fig. 16. 



Streaks on Plato, 1870, January 16. — J. Gledhill. 



elbow was seen to throw off an arm to the south, towards the streak ^ [this 

 seems to have been a portion of the streak c]. From 12 to 13 hours, Mr. 

 Gledhill says, " /3 is fine and bright, but I cannot trace it beyond spot No. 3. 

 The sector is very bright ; it passes beyond spot No. 4 and meets streak /3 to 



