﻿and 
  Fluidity 
  of 
  Sodium 
  Chloride 
  Solution*. 
  489 
  

  

  only 
  used 
  for 
  setting 
  the 
  surface 
  of 
  the 
  solution 
  at 
  a 
  definite 
  

   level 
  in 
  that 
  limb, 
  while 
  readings 
  in 
  the 
  other 
  limb 
  were 
  

   being 
  made. 
  Sufficient 
  of 
  the 
  solution 
  was 
  first 
  run 
  in 
  to 
  fill 
  

   the 
  bulb 
  and 
  tubes 
  just 
  above 
  A 
  and 
  B. 
  Its 
  weight 
  was 
  

   obtained, 
  and 
  the 
  pressure 
  of 
  a 
  screw-clip 
  on 
  an 
  air-reservoir 
  

   attached 
  to 
  D 
  was 
  so 
  adjusted 
  that 
  the 
  level 
  was 
  exactly 
  at 
  

   the 
  mark 
  B. 
  The 
  reading 
  in 
  A 
  was 
  then 
  noted 
  and 
  the 
  

  

  Fig-. 
  1. 
  — 
  Glischrornetei 
  

  

  c 
  

  

  temperature 
  and 
  the 
  volume 
  of 
  the 
  solution 
  could 
  be 
  cal- 
  

   culated, 
  and 
  the 
  density 
  at 
  that 
  temperature 
  deduced. 
  At 
  

   higher 
  temperatures, 
  the 
  mark 
  II. 
  in 
  B 
  D 
  was 
  used 
  instead 
  

   of 
  mark 
  I., 
  and 
  at 
  still 
  higher 
  temperatures, 
  marks 
  III. 
  and 
  

   IV. 
  The 
  actual 
  values 
  in 
  scale-divisions 
  of 
  these 
  intervals 
  

   had 
  been 
  previously 
  calculated, 
  and 
  the 
  coefficient 
  of 
  ex- 
  

   pansion 
  of 
  the 
  glass 
  in 
  the 
  dilatometer 
  was 
  also 
  determined. 
  

   The 
  volume 
  between 
  B 
  and 
  A 
  was 
  also 
  found, 
  and 
  the 
  

   absolute 
  value 
  of 
  the 
  scale-divisions 
  in 
  A 
  C. 
  

  

  