﻿246 
  

  

  COLLECTION 
  OP 
  OBSERVATIONS 
  ON 
  THE 
  

  

  The 
  telescope 
  used 
  for 
  observation 
  was 
  one 
  of 
  Dollond's 
  refractors; 
  

   the 
  power 
  used 
  was 
  50, 
  which 
  was 
  preferred 
  to 
  the 
  80 
  or 
  100, 
  because 
  

   it 
  gave 
  a 
  much 
  clearer 
  view 
  than 
  these 
  latter. 
  

  

  Venus 
  was 
  seen 
  during 
  one 
  hour 
  and 
  three 
  quarters. 
  Two 
  ther- 
  

   mometers, 
  Fahrenheit's 
  scale, 
  were 
  placed 
  in 
  the 
  sun, 
  one 
  of 
  which 
  

   had 
  the 
  bulb 
  covered 
  with 
  thin 
  blackened 
  paper. 
  Another 
  thermom- 
  

   eter 
  was 
  suspended 
  on 
  the 
  north 
  side 
  of 
  a 
  brick 
  building, 
  and 
  was 
  of 
  

   course 
  in 
  the 
  shade. 
  

  

  

  Thermometer 
  in 
  the 
  Sun. 
  

  

  

  

  Time. 
  

  

  

  

  Therm, 
  in 
  Shade. 
  

  

  Barometer. 
  

  

  

  Naked 
  bulb. 
  

  

  Blackened 
  bulb. 
  

  

  

  

  h. 
  m. 
  

  

  deg. 
  

  

  deg. 
  

  

  deg. 
  

  

  deg. 
  

  

  11 
  23 
  

  

  66.5 
  

  

  82.5 
  

  

  47 
  

  

  29.710 
  

  

  33 
  

  

  67 
  

  

  87 
  

  

  47 
  

  

  710 
  

  

  43 
  

  

  69.5 
  

  

  87 
  

  

  47 
  

  

  700 
  

  

  53* 
  

  

  70.5 
  

  

  87 
  

  

  47 
  

  

  695 
  

  

  12 
  03 
  

  

  72 
  

  

  87 
  

  

  47 
  

  

  670 
  

  

  13 
  

  

  69.5 
  

  

  80 
  

  

  47.5 
  

  

  662 
  

  

  23 
  

  

  66.5 
  

  

  76.5 
  

  

  48 
  

  

  658 
  

  

  33 
  

  

  66.5 
  

  

  75 
  

  

  47.25 
  

  

  650 
  

  

  43 
  

  

  66 
  

  

  72.5 
  

  

  48 
  

  

  640 
  

  

  53 
  

  

  66 
  

  

  71 
  

  

  47 
  

  

  63S 
  

  

  1 
  03 
  

  

  63 
  

  

  64.5 
  

  

  46.25 
  

  

  630 
  

  

  13 
  

  

  59.5 
  

  

  59.5 
  

  

  46 
  

  

  630 
  

  

  23t 
  

  

  56.5 
  

  

  56 
  

  

  45.5 
  

  

  625 
  

  

  33 
  

  

  57 
  

  

  57.5 
  

  

  45 
  

  

  618 
  

  

  43 
  

  

  57.5 
  

  

  59.5 
  

  

  45 
  

  

  610 
  

  

  53 
  

  

  61.5 
  

  

  64.5 
  

  

  46 
  

  

  610 
  

  

  2 
  03 
  

  

  64 
  

  

  69 
  

  

  46.5 
  

  

  620 
  

  

  13 
  

  

  -66.5 
  

  

  69.5 
  

  

  48 
  

  

  620 
  

  

  23 
  

  

  68 
  

  

  73 
  

  

  48 
  

  

  610 
  

  

  33 
  

  

  6S 
  

  

  73 
  

  

  48 
  

  

  600 
  

  

  43J 
  

  

  

  

  

  

  It 
  will 
  be 
  seen 
  from 
  these 
  observations 
  that 
  the 
  naked 
  thermometer 
  

   in 
  the 
  sun 
  continued 
  to 
  rise 
  until 
  ten 
  minutes 
  after 
  the 
  eclipse 
  began, 
  

   when 
  it 
  stood 
  at 
  72°. 
  That 
  the 
  blackened 
  thermometer 
  had 
  then 
  

   risen 
  to 
  87°, 
  and 
  that 
  at 
  the 
  greatest 
  obscuration 
  both 
  had 
  fallen 
  to 
  

   nearly 
  the 
  same 
  degree; 
  the 
  naked 
  thermometer 
  to 
  56.5° 
  through 
  15.5°, 
  

  

  * 
  Eclipse 
  begins. 
  

  

  t 
  Greatest 
  obscuration. 
  

  

  X 
  Eclipse 
  had 
  endecK 
  

  

  