﻿C. 
  Barus 
  — 
  Continuity 
  of 
  Solid 
  and 
  Liquid. 
  137 
  

  

  added, 
  after 
  which 
  R 
  can 
  be 
  expressed 
  as 
  a 
  volume 
  increment, 
  

   referred 
  as 
  jet 
  to 
  an 
  arbitrary 
  fiducial 
  zero, 
  §§ 
  13, 
  14. 
  The 
  

   corresponding 
  volume 
  (last 
  column 
  of 
  the 
  tables) 
  is 
  deduced 
  

   from 
  this 
  by 
  inserting 
  the 
  initial 
  volume 
  values 
  of 
  §9. 
  Cf. 
  §17. 
  

  

  Two 
  data 
  are 
  usually 
  given 
  for 
  each 
  step 
  of 
  pressure, 
  the 
  

   second 
  of 
  which, 
  obtained 
  after 
  long 
  waiting 
  (5 
  m 
  or 
  more) 
  is 
  

   more 
  nearly 
  isothermal 
  than 
  the 
  first. 
  In 
  most 
  cases, 
  a 
  small 
  

   additional 
  volume 
  decrement 
  takes 
  place 
  after 
  solidification, 
  

   either 
  viscously 
  or 
  as 
  the 
  results 
  of 
  gradual 
  decrease 
  of 
  tem- 
  

   perature. 
  

  

  Parentheses 
  occur 
  to 
  show 
  that 
  for 
  the 
  data 
  enclosed 
  the 
  

   measurement 
  was 
  made 
  along 
  an 
  (upper) 
  part 
  of 
  the 
  tube 
  hk, 
  

   figure 
  1, 
  whose 
  calibre 
  was 
  not 
  sufficiently 
  uniform. 
  Without 
  

   knowing 
  the 
  full 
  expansions 
  at 
  the 
  higher 
  temperatures 
  and 
  

   lower 
  pressures, 
  it 
  is 
  a 
  priori 
  impossible 
  so 
  to 
  fill 
  the 
  tube 
  that 
  

   all 
  measurements 
  fall 
  within 
  calibrated 
  parts, 
  and 
  all 
  other 
  

   calibration 
  conditions 
  are 
  complied 
  with, 
  §9. 
  These 
  approxima- 
  

   tions 
  however 
  refer 
  to 
  the 
  liquid 
  state, 
  and 
  are 
  thus 
  of 
  less 
  

   consequence 
  in 
  this 
  paper, 
  §1. 
  If 
  the 
  isothermals 
  of 
  the 
  liquid 
  

   only 
  were 
  sought, 
  it 
  would 
  be 
  advisable 
  to 
  make 
  the 
  tube 
  hk 
  

   very 
  much 
  more 
  nearly 
  capillary 
  from 
  the 
  outset. 
  

  

  The 
  experiments 
  were 
  made 
  on 
  different 
  days, 
  and 
  together 
  

   extended 
  over 
  more 
  than 
  a 
  week. 
  This 
  is 
  too 
  long 
  a 
  time 
  to 
  

   employ 
  the 
  tube 
  without 
  special 
  readjustment, 
  and 
  some 
  shift- 
  

   ing 
  of 
  coordinates 
  may 
  therefore 
  have 
  occurred. 
  §§10, 
  25, 
  26. 
  

  

  I 
  may 
  add 
  finally 
  that 
  the 
  melting 
  point 
  of 
  naphthalene 
  in 
  

   air 
  is 
  about 
  80°, 
  its 
  solidification 
  point 
  below 
  this, 
  under 
  proper 
  

   conditions. 
  The 
  density 
  of 
  the 
  solid 
  is 
  1'14, 
  and 
  that 
  of 
  the 
  

   liquid 
  at 
  82°, 
  is 
  *724, 
  §8. 
  Hence 
  naphthalene 
  melted 
  in 
  water 
  

   sinks 
  or 
  swims, 
  according 
  as 
  its 
  temperature 
  is 
  sufficiently 
  

   below 
  or 
  above 
  80°. 
  

  

  16. 
  Solid 
  isothermal, 
  63°. 
  — 
  Clearly 
  the 
  data 
  obtained 
  in 
  

   operating 
  on 
  the 
  solid 
  will 
  be 
  less 
  accurate 
  than 
  the 
  liquid 
  

  

  Table 
  5. 
  — 
  Isothermals 
  of 
  (solid) 
  naphthalene, 
  at 
  63 
  - 
  5°, 
  referred 
  to 
  "55 
  cm. 
  3 
  , 
  at 
  the 
  

   normal 
  melting 
  point. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  R. 
  

  

  hp 
  

   x 
  10 
  3 
  

  

  Volume. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  R. 
  

  

  kp 
  y 
  

   x 
  10 
  3 
  

  

  olume. 
  

  

  m. 
  

  

  aim. 
  

  

  ohms. 
  

  

  

  cm. 
  3 
  

  

  m. 
  

  

  aim. 
  

  

  ohms. 
  

  

  

  cm. 
  3 
  

  

  16 
  

  

  70 
  

  

  7600 
  

  

  3 
  

  

  •4127 
  

  

  38 
  

  

  859 
  

  

  8240 
  

  

  39 
  

  

  3965 
  

  

  19 
  

  

  68 
  

  

  7430 
  

  

  3 
  

  

  •4156 
  

  

  40 
  

  

  850 
  

  

  8120 
  

  

  38 
  

  

  3988 
  

  

  20 
  

  

  289 
  

  

  7760 
  

  

  13 
  

  

  •4085 
  

  

  42 
  

  

  972 
  

  

  8310 
  

  

  44 
  

  

  3945 
  

  

  23 
  

  

  281 
  

  

  7630 
  

  

  13 
  

  

  •4109 
  

  

  44 
  

  

  966 
  

  

  8310 
  

  

  44 
  

  

  3945 
  

  

  25 
  

  

  491 
  

  

  8160 
  

  

  22 
  

  

  •4003 
  

  

  46 
  

  

  565 
  

  

  7600 
  

  

  25 
  

  

  4097 
  

  

  29 
  

  

  481 
  

  

  8010 
  

  

  22 
  

  

  •4027 
  

  

  49 
  

  

  565 
  

  

  7605 
  

  

  25 
  

  

  4097 
  

  

  34 
  

  

  675 
  

  

  8050 
  

  

  30 
  

  

  •4010 
  

  

  51 
  

  

  100 
  

  

  7270 
  

  

  4 
  

  

  4183 
  

  

  37 
  

  

  662 
  

  

  7880 
  

  

  30 
  

  

  •4039 
  

  

  67 
  

  

  65 
  

  

  7340 
  

  

  3 
  

  

  4173 
  

  

  