﻿RED 
  PROMINENCES 
  SEEN 
  DURING 
  TOTAL 
  ECLIPSES 
  OF 
  THE 
  SUN. 
  453 
  

  

  subtended 
  an 
  angle 
  of 
  not 
  less 
  than 
  4 
  0, 
  5 
  on 
  the 
  moon's 
  limb 
  ;* 
  and 
  its 
  figure 
  being 
  

   irregular, 
  the 
  different 
  observers 
  may 
  have 
  estimated 
  the 
  position 
  of 
  points 
  in 
  it 
  

   whose 
  places 
  varied 
  considerably. 
  

  

  Angles 
  of 
  Position 
  of 
  the 
  Hook- 
  Shaped 
  Prominence, 
  

  

  Observer. 
  

  

  Station. 
  

  

  Angle 
  of 
  Position 
  of 
  Hook- 
  

   Shaped 
  Prominence 
  from 
  

   Sun's 
  North 
  Point. 
  

  

  Angles 
  of 
  Position 
  of 
  Spots 
  

   near 
  the 
  Sun's 
  Limb. 
  

  

  Dawes, 
  

  

  Swan, 
  

  

  Wichmann, 
  

  

  Ravelsberg, 
  

  

  Goteborg, 
  

  

  Konigsberg, 
  

  

  282° 
  30' 
  

   282 
  8 
  

   284 
  

  

  88° 
  0' 
  

   87 
  17 
  

   86 
  40 
  

  

  288° 
  47' 
  

   287 
  7 
  

  

  It 
  thus 
  appears, 
  that 
  the 
  discrepancies 
  in 
  the 
  angles 
  of 
  position, 
  cannot 
  be 
  

   explained 
  on 
  the 
  hypothesis 
  that 
  the 
  prominences 
  are 
  merely 
  optical 
  phenomena 
  

   which 
  appeared 
  differently 
  at 
  different 
  stations 
  ; 
  for 
  as 
  great 
  differences 
  occur 
  be- 
  

   tween 
  observations 
  made 
  at 
  the 
  same 
  place, 
  as 
  between 
  those 
  made 
  at 
  stations 
  

   widely 
  removed 
  from 
  each 
  other. 
  It 
  has 
  also 
  been 
  seen, 
  that 
  where 
  the 
  angles 
  

   of 
  position 
  were 
  carefully 
  ascertained, 
  the 
  places 
  of 
  prominences 
  seen 
  at 
  distant 
  

   stations, 
  situated 
  very 
  differently 
  in 
  the 
  moon's 
  shadow 
  agreed 
  closely 
  ; 
  which 
  

   is 
  unfavourable 
  to 
  the 
  idea 
  that 
  these 
  objects 
  are 
  merely 
  optical 
  phenomena. 
  

  

  2. 
  On 
  the 
  Discrepancies 
  in 
  the 
  Forms 
  assigned 
  to 
  the 
  Red 
  Prominences 
  by 
  

  

  different 
  Observers. 
  

  

  The 
  forms 
  assigned 
  by 
  different 
  observers 
  to 
  the 
  red 
  prominences 
  exhibit, 
  

   as 
  might 
  be 
  expected, 
  considerable 
  diversity. 
  The 
  large 
  hook-shaped 
  promi- 
  

   nence, 
  to 
  which 
  reference 
  has 
  been 
  so 
  often 
  made, 
  was 
  seen 
  by 
  every 
  one, 
  and 
  

   engrossed 
  a 
  large 
  share 
  of 
  attention. 
  Several 
  drawings 
  of 
  this 
  remarkable 
  object 
  

   by 
  different 
  observers, 
  are 
  given 
  in 
  fig. 
  9, 
  Plate 
  XI. 
  f 
  In 
  its 
  neighbourhood 
  was 
  a 
  

   small 
  red 
  spot, 
  completely 
  detached 
  from 
  the 
  sun's 
  limb, 
  and 
  also 
  a 
  low 
  promi- 
  

   nence, 
  neither 
  of 
  which 
  was 
  seen 
  by 
  all 
  the 
  observers. 
  The 
  drawings 
  of 
  this 
  

   group 
  differ 
  in 
  the 
  occasional 
  absence 
  of 
  the 
  smaller 
  detached 
  prominence, 
  or 
  of 
  

   the 
  low 
  one, 
  and 
  also 
  in 
  the 
  form 
  assigned 
  to 
  the 
  hook-shaped 
  prominence 
  ; 
  but 
  

   all 
  agree 
  in 
  giving 
  the 
  latter 
  a 
  form 
  curved 
  in 
  the 
  same 
  direction. 
  Considering 
  the 
  

   hasty 
  nature 
  of 
  the 
  observations, 
  the 
  various 
  powers 
  possessed 
  by 
  different 
  indi- 
  

   viduals 
  of 
  delineating 
  objects, 
  and 
  the 
  fact 
  that 
  the 
  drawings 
  must 
  either 
  have 
  been 
  

  

  f 
  In 
  this 
  estimation 
  it 
  is 
  supposed 
  that 
  the 
  breadth 
  of 
  the 
  prominence 
  was 
  about 
  two-thirds 
  

   of 
  its 
  height, 
  or 
  80"; 
  an 
  assumption 
  which 
  seems 
  fully 
  warranted 
  by 
  the 
  drawings 
  of 
  the 
  prominence 
  

   given 
  by 
  most 
  of 
  the 
  observers. 
  

  

  f 
  The 
  drawings 
  of 
  the 
  hook- 
  shaped 
  prominence 
  in 
  fig. 
  9, 
  are 
  all 
  taken 
  from 
  the 
  Royal 
  Astro- 
  

   nomical 
  Society's 
  Notice 
  for 
  January, 
  with 
  the 
  exception 
  of 
  Mr 
  Adie's, 
  which 
  is 
  enlarged 
  from 
  

   the 
  plate 
  accompanying 
  his 
  account 
  of 
  the 
  eclipse 
  in 
  the 
  Edinburgh 
  New 
  Philosophical 
  Journal. 
  

  

  VOL. 
  XX. 
  PART 
  III. 
  6 
  F 
  

  

  