﻿748 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  be 
  used, 
  having 
  12 
  to 
  16 
  staves, 
  with 
  openings 
  from 
  one 
  eighth 
  

   to 
  three 
  eighths 
  of 
  an 
  inch 
  between 
  the 
  staves, 
  hut 
  if 
  this 
  is 
  done 
  

   a 
  record 
  of 
  it 
  must 
  be 
  attached 
  to 
  the 
  official 
  report 
  of 
  the 
  test. 
  

  

  3 
  Composition 
  of 
  the 
  charge. 
  All 
  tests 
  must 
  be 
  made 
  on 
  

   charges 
  composed 
  of 
  one 
  kind 
  of 
  material 
  at 
  a 
  time. 
  iN'o 
  test 
  shall 
  

   be 
  considered 
  official 
  where 
  two 
  or 
  more 
  different 
  bricks 
  or 
  mate- 
  

   rials 
  have 
  been 
  used 
  to 
  compose 
  a 
  charge. 
  

  

  4 
  . 
  Quantity 
  of 
  the 
  charge. 
  The 
  quantity 
  of 
  the 
  charge 
  shall 
  be 
  

   estimated 
  by 
  its 
  bulk 
  and 
  not 
  by 
  its 
  weight. 
  The 
  bulk 
  of 
  the 
  

   standard 
  charge 
  shall 
  be 
  equal 
  to 
  15^ 
  of 
  the 
  cubic 
  contents 
  of 
  the 
  

   rattling 
  chamber, 
  and 
  the 
  number 
  of 
  whole 
  brick 
  whose 
  united 
  

   volume 
  comes 
  nearest 
  to 
  this 
  amount 
  shall 
  constitute 
  a 
  charge. 
  

  

  5 
  Revolutions 
  of 
  the 
  charge. 
  The 
  number 
  of 
  revolutions 
  of 
  a 
  

   standard 
  test 
  shall 
  be 
  1800, 
  and 
  the 
  speed 
  of 
  rotation 
  shall 
  be 
  

   30 
  a 
  minute. 
  The 
  belt 
  power 
  shall 
  be 
  sufficient 
  to 
  rotate 
  the 
  

   rattler 
  at 
  the 
  same 
  speed 
  whether 
  charged 
  or 
  empty. 
  Other 
  speeds 
  

   of 
  rotation 
  between 
  24 
  and 
  36 
  revolutions 
  a 
  minute 
  may 
  be 
  used, 
  

   but 
  in 
  this 
  case 
  a 
  record 
  of 
  the 
  speed 
  must 
  be 
  attached 
  to 
  the 
  official 
  

   report. 
  

  

  6 
  Conditions 
  of 
  the 
  charge. 
  The 
  bricks 
  composing 
  a 
  charge 
  

   shall 
  be 
  dry 
  and 
  clean, 
  and, 
  as 
  nearly 
  as 
  may 
  be 
  possible, 
  in 
  the 
  

   condition 
  in 
  which 
  they 
  are 
  drawn 
  from 
  the 
  kiln. 
  

  

  7 
  Calculation 
  of 
  the 
  results. 
  The 
  loss 
  shall 
  be 
  calculated 
  in 
  

  

  percentage 
  of 
  the 
  weight 
  of 
  the 
  dry 
  brick 
  composing 
  the 
  charge, 
  

  

  and 
  no 
  result 
  shall 
  be 
  considered 
  as 
  official 
  unless 
  it 
  is 
  the 
  average 
  

  

  of 
  two 
  distinct 
  and 
  complete 
  tests, 
  made 
  on 
  separate 
  charges 
  of 
  

  

  brick. 
  

  

  Specifications 
  for 
  absorption 
  test 
  

  

  1 
  The 
  number 
  of 
  bricks 
  for 
  a 
  standard 
  test 
  shall 
  be 
  ^'ve>. 
  

  

  2 
  The 
  test 
  must 
  be 
  conducted 
  on 
  rattled 
  bricks. 
  If 
  none 
  such 
  

   are 
  available, 
  the 
  whole 
  bricks 
  must 
  be 
  broken 
  in 
  halves 
  before 
  

   treatment. 
  

  

  3 
  The 
  bricks 
  should 
  be 
  dried 
  for 
  48 
  hours 
  at 
  a 
  temperature 
  

   ranging 
  from 
  230° 
  to 
  250° 
  F. 
  before 
  weighing 
  for 
  the 
  initial 
  dry 
  

   weight 
  

  

  