﻿CLAYS 
  OF 
  NEW 
  YORK 
  

  

  747 
  

  

  six 
  months' 
  immersion, 
  though 
  the 
  great 
  bulk 
  of 
  the 
  water 
  was 
  

   taken 
  in 
  the 
  first 
  week. 
  

  

  Broken 
  bricks 
  absorb 
  more 
  water 
  than 
  whole 
  ones, 
  and 
  small 
  

   pieces 
  from 
  the 
  interior 
  of 
  the 
  brick 
  absorb 
  more 
  proportionately 
  

   than 
  large 
  ones. 
  

  

  The 
  following 
  conclusions 
  were 
  reached. 
  

  

  1 
  That 
  to 
  obtain 
  accurate 
  absorption 
  figures, 
  a 
  hard 
  brick 
  will 
  

   require 
  not 
  less 
  than 
  four 
  days' 
  drying 
  and 
  eight 
  weeks' 
  soaking. 
  

  

  2 
  That 
  only 
  roughly 
  approximate 
  figures 
  are 
  obtained 
  within 
  time 
  

   limits 
  which 
  would 
  be 
  short 
  enough 
  to 
  make 
  the 
  figures 
  useful 
  for 
  

   ordinary 
  competitive 
  tests 
  of 
  material 
  for 
  immediate 
  use. 
  

  

  3 
  That 
  only 
  rattled 
  bricks 
  should 
  be 
  used 
  for 
  the 
  absorption 
  test, 
  

   as 
  the 
  absorptive 
  power 
  of 
  brick 
  in 
  use 
  is 
  increased 
  by 
  its 
  chipping 
  

   and 
  grinding 
  under 
  traffic. 
  

  

  4 
  'No 
  relation 
  seems 
  to 
  exist 
  between 
  loss 
  by 
  rattling 
  and 
  per- 
  

   centage 
  of 
  absorption. 
  

  

  As 
  a 
  result 
  of 
  the 
  committee's 
  experiments 
  the 
  following 
  speci- 
  

   fications 
  were 
  adopted. 
  

  

  Specifications 
  for 
  abrasion 
  test 
  

  

  1 
  Dimensions 
  of 
  the 
  machine. 
  The 
  standard 
  machine 
  shall 
  be 
  

   28 
  inches 
  in 
  diameter 
  and 
  20 
  inches 
  in 
  length, 
  measured 
  inside 
  

   the 
  rattling 
  chamber. 
  Other 
  machines 
  may 
  be 
  used, 
  varying 
  in 
  

   diameter 
  between 
  26 
  and 
  30 
  inches, 
  and 
  in 
  length 
  from 
  18 
  to 
  24 
  

   inches, 
  but 
  if 
  this 
  is 
  done, 
  a 
  record 
  of 
  it 
  must 
  be 
  attached 
  to 
  the 
  

   official 
  report. 
  Long 
  rattlers 
  may 
  be 
  cut 
  up 
  into 
  sections 
  of 
  suit- 
  

   able 
  length 
  by 
  the 
  insertion 
  of 
  iron 
  diaphragms 
  at 
  proper 
  points. 
  

  

  2 
  Construction 
  of 
  the 
  machine. 
  The 
  barrel 
  shall 
  be 
  supported 
  

   on 
  trunnions 
  at 
  either 
  end; 
  in 
  no 
  case 
  shall 
  a 
  shaft 
  pass 
  through 
  

   the 
  rattling 
  chamber. 
  The 
  cross 
  section 
  of 
  the 
  barrel 
  shall 
  be 
  a 
  

   regular 
  polygon, 
  having 
  14 
  sides. 
  The 
  heads 
  and 
  staves 
  shall 
  be 
  

   composed 
  of 
  gray 
  cast 
  iron, 
  not 
  chilled 
  or 
  casehardened. 
  There 
  

   shall 
  be 
  a 
  space 
  of 
  one 
  fourth 
  of 
  an 
  inch 
  between 
  the 
  staves 
  for 
  

   the 
  escape 
  of 
  dust 
  and 
  small 
  pieces 
  of 
  waste. 
  Other 
  machines 
  may 
  

  

  