﻿SOLAR 
  ECLIPSE 
  OF 
  NOVEMBER 
  30, 
  1834. 
  247 
  

  

  blackened 
  to 
  56° 
  through 
  31°. 
  The 
  thermometer 
  in 
  the 
  shade 
  fell 
  

   only 
  two 
  degrees, 
  from 
  47° 
  to 
  45°. 
  The 
  changes 
  of 
  the 
  thermometer 
  

   in 
  the 
  shade, 
  as 
  well 
  as 
  of 
  the 
  barometer, 
  present 
  some 
  anomalies, 
  no 
  

   doubt 
  caused 
  in 
  both 
  by 
  the 
  sudden 
  diminution 
  of 
  heat. 
  The 
  descent 
  

   of 
  the 
  mercury 
  in 
  the 
  barometer 
  generally 
  continues 
  with 
  much 
  uni- 
  

   formity 
  until 
  about 
  three 
  o'clock, 
  when 
  it 
  reaches 
  the 
  minimum 
  posi- 
  

   tion. 
  On 
  this 
  occasion 
  it 
  rose 
  a 
  little 
  about 
  two 
  o'clock, 
  and 
  after 
  

   twenty 
  minutes 
  fell 
  again. 
  At 
  twenty 
  minutes 
  past 
  one 
  o'clock 
  a 
  lens 
  

   one 
  foot 
  in 
  diameter, 
  whose 
  principal 
  focal 
  length 
  is 
  two 
  feet, 
  was 
  not 
  

   able 
  to 
  collect 
  sufficient 
  rays 
  to 
  burn 
  blackened 
  paper, 
  though 
  perfectly 
  

   dry 
  ; 
  but 
  when 
  brought 
  to 
  bear 
  upon 
  the 
  bulb 
  of 
  a 
  thermometer 
  for 
  

   two 
  minutes, 
  caused 
  a 
  rise 
  from 
  54° 
  to 
  57°. 
  

  

  