﻿High 
  Temper 
  atui'es. 
  

  

  ITT 
  

  

  vations 
  still 
  higher, 
  but 
  at 
  about 
  810° 
  a 
  violent 
  decomposition 
  

   set 
  in 
  and 
  in 
  a 
  few 
  moments 
  the 
  entire 
  bath 
  had 
  boiled 
  away. 
  

   Hydrogen 
  in 
  porcelain 
  hulhs. 
  — 
  At 
  first 
  one 
  of 
  these 
  bulbs 
  

   (No. 
  II) 
  was 
  used 
  filled 
  with 
  hydrogen, 
  as 
  in 
  the 
  case 
  of 
  the 
  

   glass 
  bulb 
  ; 
  here, 
  however, 
  the 
  bulb 
  was 
  evacuated 
  at 
  T00° 
  

   instead 
  of 
  500°, 
  then 
  rinsed 
  as 
  before 
  with 
  the 
  dry 
  gas. 
  Table 
  

   III 
  contains 
  two 
  sets 
  of 
  results 
  obtained 
  under 
  these 
  conditions. 
  

  

  Table 
  III.* 
  

  

  Bulb 
  (Xo. 
  II). 
  — 
  Berlin 
  porcelain 
  glazed 
  inside 
  and 
  out. 
  Gas 
  — 
  HvdrogeD. 
  

  

  Y. 
  = 
  101-136'=<^'°. 
  v, 
  = 
  2-83-«'^. 
  3.3=0-0000132. 
  

  

  After 
  heating. 
  

  

  Ho 
  

  

  a 
  

  

  t 
  

  

  ei 
  ( 
  

  

  Dbs.-Calcul. 
  

  

  ]st 
  day 
  

  

  529-02 
  

  

  

  

  

  

  1st 
  " 
  (2) 
  

  

  529-03 
  

  

  

  

  

  

  2d 
  " 
  

  

  

  

  309-3° 
  

  

  2258 
  

  

  + 
  i-^° 
  

  

  

  

  

  410-1 
  

  

  3179 
  

  

  ^1-2 
  

  

  

  

  

  527-6 
  

  

  4303 
  

  

  + 
  0-8 
  

  

  

  

  

  611-4 
  

  

  5119 
  

  

  + 
  2-1, 
  

  

  4th 
  " 
  

  

  527-56 
  

  

  

  

  

  

  4th 
  " 
  

  

  527-58 
  

  

  0-003669 
  

  

  

  

  

  5th 
  '' 
  

  

  

  

  407-9 
  

  

  3158 
  

  

  -\-l'3 
  

  

  

  

  

  521-9 
  

  

  1,231, 
  

  

  -\-2-6 
  

  

  

  

  

  601-8 
  

  

  5015 
  

  

  + 
  3-0 
  

  

  

  

  

  708-6 
  

  

  6100 
  

  

  + 
  3-2 
  

  

  6th 
  " 
  

  

  525-36. 
  

  

  0-003672 
  

  

  

  

  

  7th 
  " 
  

  

  

  

  499-1 
  

  

  1,018 
  

  

  + 
  1-8 
  

  

  

  

  

  609-6 
  

  

  5093 
  

  

  -\-3-0 
  

  

  

  

  

  653-3 
  

  

  5527 
  

  

  + 
  3-7 
  

  

  

  

  

  729-3 
  

  

  6310 
  

  

  + 
  5-7 
  

  

  8th 
  " 
  

  

  522-48 
  

  

  0-003678 
  

  

  

  

  

  Bulb 
  freshly 
  filled. 
  

  

  

  

  

  

  1st 
  day 
  

  

  532-03 
  

  

  0'0036G5 
  

  

  

  

  

  3d 
  " 
  

  

  

  

  536-6 
  

  

  1,393 
  

  

  + 
  (9-7 
  

  

  

  

  

  613-6 
  

  

  511,2 
  

  

  +'2-2 
  

  

  

  

  

  677-6 
  

  

  5777 
  

  

  + 
  3-5 
  

  

  

  

  

  725-2 
  

  

  6269 
  

  

  + 
  3-6 
  

  

  4th 
  " 
  

  

  529-37 
  

  

  0-003675 
  

  

  

  

  

  After 
  each 
  heating 
  a 
  considerable 
  fall 
  in 
  the 
  ice 
  point 
  (H^) 
  

   is 
  noticeable 
  and 
  an 
  increase 
  in 
  the 
  coefficient 
  of 
  expansion 
  of 
  

   the 
  gas. 
  This 
  seems 
  to 
  point 
  to 
  a 
  chemical 
  action 
  at 
  the 
  higher 
  

   temperatures 
  between 
  the 
  hydrogen 
  and 
  the 
  walls 
  of 
  the 
  bulb 
  

   and 
  the 
  generation 
  of 
  water 
  vapor. 
  

  

  Nitrogen. 
  — 
  For 
  the 
  reason 
  named, 
  the 
  use 
  of 
  hydrogen 
  at 
  

   high 
  temperatures 
  was 
  abandoned 
  and 
  nitrogen 
  substituted. 
  

   This 
  was 
  obtained 
  from 
  atmospheric 
  air 
  by 
  passiug 
  it 
  through 
  

   from 
  four 
  to 
  six 
  wash 
  bottles 
  filled 
  with 
  an 
  alkaline 
  solu- 
  

   tion 
  of 
  pyrogallic 
  acid, 
  thence 
  after 
  continuing 
  on 
  through 
  

  

  * 
  Values 
  of 
  e 
  printed 
  in 
  italics 
  were 
  not 
  used 
  in 
  the 
  determination 
  of 
  Tables 
  II 
  

   and 
  X. 
  

  

  