﻿CLAYS 
  OF 
  NEW 
  YORK 
  

  

  761 
  

  

  together 
  in 
  tlie 
  same 
  kiln, 
  show 
  that 
  end-cut 
  bricks 
  possess 
  a 
  de- 
  

   cided 
  superiority 
  over 
  side-cut 
  bricks, 
  and 
  also 
  show 
  the 
  marked 
  

   advantage 
  of 
  repressing 
  end-cut 
  and 
  the 
  disadvantage 
  of 
  repress- 
  

   ing 
  side-cut 
  bricks. 
  

  

  Rattling 
  tests 
  made 
  by 
  Prof. 
  Edward 
  Orton 
  jr 
  on 
  paving 
  bricks 
  

  

  EXD-CUT 
  BKICKS 
  

  

  Loss 
  in 
  weight 
  at 
  the 
  end 
  Average 
  

  

  ^ 
  . 
  ^. 
  ^ 
  modulus 
  

  

  Description 
  > 
  -^ 
  of 
  

  

  100) 
  revolu- 
  2001 
  revolu- 
  ruoture 
  

  

  tions 
  tions 
  ^ 
  

  

  Per 
  cent 
  Per 
  cent 
  Pounds 
  

  

  Kepressed 
  18.23 
  26.67 
  2 
  525 
  

  

  Plain 
  21.05 
  28.48 
  2 
  425 
  

  

  Average 
  of 
  both 
  19 
  . 
  54 
  27 
  . 
  00 
  2 
  463 
  

  

  SIDE-CUT 
  BRICKS 
  

  

  Eepressed 
  26.51 
  35 
  . 
  30 
  2 
  347 
  

  

  Plain 
  22.73 
  31.42 
  2 
  346 
  

  

  Average 
  of 
  both 
  24.43 
  32 
  . 
  90 
  2 
  347 
  

  

  DRY 
  PRESSED 
  BRICKS 
  

  

  Coarse 
  19.40 
  25.20 
  2 
  507 
  

  

  Medium 
  23.80 
  28.26 
  2 
  740 
  

  

  Fine 
  20.07 
  29.71 
  2 
  687 
  

  

  Average 
  of 
  all 
  21.09 
  27.72 
  2 
  644 
  

  

  As 
  regards 
  the 
  crushing 
  test, 
  experiments 
  given 
  below 
  show 
  

   that, 
  even 
  with 
  the 
  same 
  material, 
  a 
  wide 
  range 
  of 
  results 
  is 
  ob- 
  

   tained, 
  depending 
  on 
  the 
  method 
  of 
  preparing 
  the 
  surface. 
  

  

  Prof. 
  I. 
  0. 
  Baker 
  prepared 
  a 
  number 
  as 
  follows 
  : 
  

  

  1 
  Grinding 
  as 
  nearly 
  flat 
  as 
  possible 
  on 
  convex 
  side 
  of 
  emery 
  

   fitone 
  and 
  crushing 
  between 
  self-adjusting, 
  parallel 
  cast 
  iron 
  plates. 
  

  

  2 
  Removing 
  the 
  irregularities 
  of 
  surface 
  and 
  crushing 
  between 
  

   blotting 
  paper. 
  

  

  