﻿240 
  COLLECTION 
  OF 
  OBSERVATIONS 
  ON 
  THE 
  

  

  Latitude, 
  40° 
  48' 
  47".82 
  N. 
  

  

  Assumed 
  longitude, 
  4 
  h. 
  53 
  m. 
  52.7 
  sec. 
  W. 
  

  

  The 
  station 
  is 
  one 
  of 
  the 
  principal 
  points 
  of 
  the 
  triangulation 
  selected 
  

   by 
  Mr 
  Hassler 
  for 
  the 
  coast 
  survey. 
  

  

  Observations 
  were 
  made 
  on 
  the 
  day 
  of 
  the 
  eclipse, 
  by 
  order 
  of 
  Mr 
  

   Hassler, 
  to 
  determine 
  the 
  rate 
  and 
  error 
  of 
  the 
  chronometers 
  and 
  astron- 
  

   omical 
  clock. 
  The 
  apparent 
  time 
  was 
  deduced 
  from 
  the 
  sun's 
  Z. 
  D. 
  

   in 
  series 
  of 
  ten 
  repetitions, 
  each 
  measured 
  by 
  the 
  repeating 
  circle. 
  

  

  Altitudes 
  were 
  also 
  measured 
  with 
  a 
  reflecting 
  circle 
  of 
  double 
  repe- 
  

   tition 
  on 
  Mr 
  Hassler's 
  principle 
  : 
  but 
  as 
  one 
  of 
  the 
  sets 
  was 
  interrupted 
  

   by 
  the 
  tremor 
  of 
  the 
  mercury 
  from 
  the 
  motion 
  of 
  some 
  of 
  the 
  spec- 
  

   tators, 
  the 
  series 
  was 
  rendered 
  imperfect, 
  and 
  could 
  not 
  therefore 
  be 
  

   used. 
  The 
  latitude 
  was 
  determined 
  by 
  two 
  series 
  on 
  the 
  sun, 
  and 
  

   seven 
  on 
  a 
  Ursae 
  Minoris, 
  being 
  all 
  the 
  weather 
  admitted 
  of 
  during 
  the 
  

   month 
  of 
  November. 
  

  

  Observations 
  of 
  the 
  Solar 
  Eclipse 
  of 
  November 
  30th, 
  1834, 
  made 
  at 
  Baltimore. 
  By 
  

  

  Lewis 
  Brantz. 
  

  

  The 
  place 
  of 
  observation 
  is 
  about 
  one 
  mile 
  west 
  from 
  Monument 
  

   Square. 
  The 
  latitude 
  being 
  39° 
  17' 
  12" 
  W. 
  The 
  time 
  was 
  observed 
  

   minutely 
  by 
  a 
  chronometer 
  of 
  Parkinson 
  and 
  Frodsham, 
  whose 
  rate 
  

   has 
  for 
  some 
  time 
  back 
  been 
  0".5 
  slow, 
  and 
  the 
  local 
  mean 
  time 
  was 
  

   ascertained 
  by 
  sets 
  of 
  altitudes 
  of 
  the 
  sun, 
  accurately 
  observed 
  on 
  the 
  

   forenoons 
  immediately 
  preceding 
  and 
  succeeding 
  the 
  eclipse. 
  

  

  The 
  contacts 
  were 
  observed 
  by 
  a 
  Dollond's 
  achromatic 
  telescope 
  

   with 
  a 
  power 
  of 
  eighty-five, 
  assisted 
  by 
  a 
  lesser 
  one 
  of 
  about 
  thirty. 
  

   The 
  two 
  observations 
  agreed 
  so 
  nearly 
  as 
  not 
  to 
  admit 
  of 
  any 
  distinction. 
  

  

  h. 
  m. 
  sec. 
  

   Beginning, 
  12 
  51 
  58 
  mean 
  time 
  at 
  Baltimore, 
  

  

  End, 
  3 
  31 
  29^ 
  do. 
  do. 
  

  

  The 
  temperature 
  by 
  a 
  thermometer 
  exposed 
  to 
  the 
  sun, 
  and 
  by 
  an- 
  

   other 
  in 
  a 
  northern 
  exposure, 
  was 
  as 
  follows 
  : 
  

  

  