﻿Vhler 
  and 
  Patterson 
  — 
  Arc 
  Spectrum 
  of 
  Tellurium. 
  137 
  

  

  a 
  mixture 
  which 
  might 
  contain 
  it. 
  The 
  metals 
  or 
  suit- 
  

   able 
  salts 
  were 
  placed 
  in 
  shallow 
  holes 
  which 
  had 
  been 
  

   drilled 
  in 
  the 
  lower, 
  positive, 
  carbon 
  electrodes. 
  The 
  carbon 
  

   rods 
  were 
  made 
  and 
  regraphitized 
  by 
  the 
  Acheson 
  Com- 
  

   pany 
  of 
  Niagara. 
  Although 
  these 
  electrodes 
  contained 
  only 
  

   slight 
  traces 
  of 
  impurities, 
  "blank" 
  exposures 
  were 
  taken 
  

   for 
  each 
  rod. 
  Six 
  negatives 
  were 
  taken 
  on 
  each 
  film. 
  Fifteen 
  

   lines 
  have 
  been 
  absolutely 
  identified 
  as 
  belonging 
  to 
  the 
  arc 
  

   spectrum 
  of 
  tellurium. 
  All 
  of 
  these 
  lines 
  are 
  in 
  the 
  ultra- 
  

   violet 
  above 
  X3200 
  and 
  they 
  have 
  all 
  been 
  observed 
  in 
  the 
  

   spark 
  spectrum 
  by 
  other 
  investigators. 
  To 
  avoid 
  repetition 
  of 
  

   the 
  wave-lengths 
  the 
  lines 
  will 
  be 
  referred 
  to 
  by 
  the 
  arbitrary 
  

   numbers 
  in 
  the 
  first 
  column 
  of 
  the 
  following 
  table. 
  

  

  No. 
  

  

  Wave-lengths 
  

  

  Intensity 
  

  

  Character 
  

  

  1 
  

  

  3175130A 
  

  

  9 
  

  

  sharp, 
  narrow 
  reversal 
  

  

  2 
  

  

  2769*653 
  

  

  9 
  

  

  tc 
  a 
  a 
  

  

  3 
  

  

  2530-734 
  

  

  7 
  

  

  a 
  a 
  a 
  

  

  4 
  

  

  2431-771 
  

  

  1 
  

  

  fine, 
  sharp 
  

  

  5 
  

  

  2420-122 
  

  

  1 
  

  

  a 
  a 
  

  

  6 
  

  

  2385-783 
  

  

  10 
  

  

  broad, 
  wide 
  reversal 
  

  

  7 
  

  

  2383-268 
  

  

  10 
  

  

  a 
  a 
  a 
  

  

  8 
  

  

  2265-515 
  

  

  5 
  

  

  sharp, 
  narrow 
  reversal 
  

  

  9 
  

  

  2259-02 
  

  

  8 
  

  

  broad, 
  wide 
  " 
  

  

  10 
  

  

  . 
  2255-50 
  

  

  5 
  

  

  sharp, 
  narrow 
  " 
  

  

  11 
  

  

  2208-88 
  

  

  6 
  

  

  << 
  

  

  12 
  

  

  2160-12 
  

  

  6 
  

  

  u 
  

  

  13 
  

  

  2147-33 
  

  

  8 
  

  

  a 
  

  

  14 
  

  

  2143-0 
  

  

  9 
  

  

  broad, 
  wide 
  reversal 
  

  

  15 
  

  

  2081-8 
  

  

  8 
  

  

  sharp 
  

  

  By 
  means 
  of 
  the 
  meter 
  grating, 
  lines 
  1 
  and 
  2 
  were 
  readily 
  

   proved 
  to 
  belong 
  to 
  tellurium, 
  although 
  they 
  seemed 
  to 
  coin- 
  

   cide 
  with 
  the 
  lines 
  \ 
  3175-044 
  and 
  X 
  2769*939 
  of 
  tin 
  and 
  

   antimony 
  respectively. 
  In 
  other 
  words, 
  lines 
  1 
  and 
  2 
  were 
  

   always 
  present 
  in 
  the 
  arc 
  spectrum 
  of 
  tellurium 
  when 
  not 
  the 
  

   slightest 
  trace 
  of 
  the 
  strongest 
  lines 
  of 
  tin 
  and 
  antimony 
  could 
  

   be 
  seen 
  on 
  the 
  negatives. 
  Since 
  line 
  1 
  is 
  not 
  very 
  wide, 
  

   since 
  its 
  wave-length 
  differs 
  from 
  that 
  of 
  the 
  tin 
  line 
  by 
  

   only 
  0*086 
  A, 
  and 
  since 
  the 
  tin 
  line 
  in 
  question 
  is 
  one 
  of 
  

   the 
  most 
  intense 
  and 
  broad 
  arc 
  lines 
  of 
  this 
  element, 
  it 
  is 
  not 
  

   surprising 
  that 
  line 
  number 
  1 
  has 
  been 
  overlooked 
  by 
  earlier 
  

   investigators. 
  When 
  the 
  fuzzy 
  spark 
  lines 
  are 
  photographed, 
  

   the 
  quartz 
  spectrographs 
  employed 
  by 
  Kothner 
  and 
  others 
  

  

  