﻿Waggener 
  — 
  Pn 
  

  

  Form 
  of 
  Mercurial 
  Barometer. 
  387 
  

  

  As 
  the 
  meteorite 
  is 
  irregular 
  as 
  described, 
  and 
  quite 
  flat 
  and 
  

   comparatively 
  free 
  from 
  cavities 
  on 
  one 
  side, 
  the 
  question 
  

   naturally 
  arises, 
  is 
  it 
  not 
  a 
  fragment 
  thrown 
  off 
  from 
  a 
  much 
  

   larger 
  mass. 
  A 
  careful 
  examination 
  of 
  the 
  mass 
  will 
  render 
  

   such 
  a 
  theory, 
  to 
  say 
  the 
  least, 
  very 
  probable, 
  but 
  whether 
  this 
  

   mass 
  was 
  brought 
  here 
  by 
  human 
  or 
  geologic 
  agencies, 
  or 
  

   whether 
  its 
  companions 
  still 
  exist 
  in 
  the 
  vicinity, 
  it 
  is 
  at 
  

   present 
  impossible 
  to 
  state. 
  A 
  careful 
  search 
  in 
  the 
  vicinity 
  

   of 
  the 
  farm 
  where 
  it 
  was 
  found, 
  fails 
  to 
  reveal 
  any 
  other 
  

   specimens. 
  

  

  University 
  of 
  Kansas, 
  July 
  10. 
  1891. 
  

  

  Art. 
  XXX 
  VII. 
  — 
  Projyosed 
  Form 
  of 
  Mercurial 
  Barometer 
  ; 
  

   by 
  W. 
  J. 
  Waggener. 
  

  

  The 
  form 
  of 
  barometer 
  to 
  be 
  described 
  in 
  this 
  paper 
  is 
  

   shown 
  in 
  the 
  accompanying 
  figure. 
  It 
  should 
  

   be 
  made 
  with 
  all 
  its 
  parts 
  of 
  glass 
  united 
  into 
  

   a 
  single 
  piece 
  in 
  the 
  form 
  of 
  a 
  tubular 
  loop 
  

   having 
  two 
  dilatations, 
  B 
  and 
  C 
  ; 
  the 
  latter 
  

   serving 
  as 
  cistern. 
  S 
  and 
  S' 
  are 
  two 
  care- 
  

   fully 
  made 
  stop-cocks 
  connecting 
  the 
  cavity 
  

   of 
  C 
  with 
  the 
  atmosphere. 
  Through 
  S, 
  the 
  

   atmospheric 
  air 
  is 
  to 
  be 
  admitted 
  when 
  the 
  

   instrument 
  is 
  in 
  use. 
  xx 
  and 
  yy 
  are 
  prolon- 
  

   gations 
  of 
  the 
  tubes 
  T 
  and 
  T 
  r 
  into 
  the 
  cistern, 
  

   their 
  openings, 
  o, 
  o\ 
  being 
  very 
  near 
  together 
  

   and 
  to 
  the 
  center 
  of 
  the 
  cistern. 
  The 
  capac- 
  

   ity 
  of 
  the 
  latter 
  should 
  be 
  about 
  four 
  times 
  

   that 
  of 
  the 
  vacuum, 
  Vv, 
  so 
  that 
  the 
  openings 
  ■ 
  

   oo' 
  shall 
  always 
  be 
  immersed 
  in 
  mercury 
  

   whatever 
  the 
  position 
  of 
  the 
  barometer. 
  

  

  To 
  prepare 
  the 
  instrument 
  for 
  use, 
  the 
  

   manipulations 
  will 
  be 
  as 
  follows 
  : 
  

  

  1. 
  Place 
  it 
  in 
  a 
  nearly 
  horizontal 
  position 
  and 
  

  

  fill 
  the 
  whole 
  cavity 
  with 
  mercury. 
  

  

  2. 
  Close 
  the 
  cocks 
  and 
  place 
  the 
  instrument 
  in 
  

  

  the 
  erect 
  position. 
  

  

  3. 
  Open 
  the 
  cock 
  S. 
  Mercury 
  flows 
  out, 
  the 
  

  

  Torricellian 
  vacuum 
  forming 
  at 
  E, 
  C 
  re- 
  

   maining 
  filled 
  with 
  mercury. 
  

  

  4. 
  Close 
  the 
  cocks 
  tightly 
  and 
  leave 
  the 
  barom- 
  

  

  eter 
  for 
  some 
  time, 
  first 
  in 
  the 
  erect, 
  after- 
  

   ward 
  in 
  other 
  positions, 
  so 
  that 
  the 
  air 
  

   and 
  moisture 
  of 
  the 
  cavity 
  may 
  enter 
  the 
  

   vacuous 
  space. 
  

  

  