﻿CLAYS 
  OF 
  NEW 
  YORK 
  6-47 
  

  

  Rock 
  face 
  brick. 
  These 
  are 
  produced 
  by 
  trimming 
  the 
  edge 
  of 
  

   a 
  pressed 
  brick 
  with 
  chisel 
  and 
  hammer, 
  in 
  imitation 
  of 
  stone. 
  

   Their 
  beauty 
  is 
  a 
  matter 
  of 
  individual 
  taste. 
  

  

  Pressed 
  brick 
  are 
  usually 
  molded 
  either 
  by 
  the 
  dry 
  press, 
  semi- 
  

   dry 
  press, 
  or 
  stiff 
  mud 
  process. 
  In 
  the 
  last 
  case, 
  they 
  have 
  to 
  be 
  

   repressed. 
  The 
  prevalent 
  custom 
  is 
  to 
  bum 
  them 
  in 
  down-draft 
  

   kilns. 
  

  

  Crushing 
  strength 
  of 
  bricks 
  

  

  Many 
  of 
  the 
  bricks 
  manufactured 
  in 
  ^ew 
  York 
  show 
  a 
  crushing 
  

   strength 
  which 
  is 
  far 
  greater 
  than 
  is 
  necessary, 
  but 
  some, 
  sper- 
  

   cially 
  common 
  brick, 
  often 
  approach 
  the 
  limit 
  pretty 
  closely. 
  The 
  

   succeeding 
  tests 
  made 
  by 
  different 
  persons 
  give 
  the 
  strength 
  of 
  a 
  

   number 
  from 
  different 
  localities. 
  

  

  The 
  following 
  are 
  the 
  results 
  of 
  some 
  tests 
  made 
  by 
  H. 
  Wil- 
  

   liams 
  ]\I. 
  E., 
  at 
  Cornell 
  university, 
  on 
  bricks 
  from 
  ISTew 
  York 
  

   state, 
  made 
  by 
  different 
  methods 
  from 
  the 
  same 
  clay. 
  Half 
  bricks 
  

   were 
  tested 
  in 
  each 
  case, 
  and 
  plaster 
  of 
  paris 
  put 
  between 
  surfaces 
  

   of 
  bricks 
  and 
  plates 
  of 
  machine. 
  

  

  Ultimate 
  strength 
  

  

  Total 
  Persquam 
  

   men 
  

  

  PouHcLs 
  Povrids 
  

  

  1 
  Wire-cut 
  brick 
  69 
  800 
  3 
  385 
  

  

  2 
  Eed 
  brick, 
  dry-clay 
  process. 
  Glens 
  Falls. 
  . 
  . 
  34 
  660 
  3 
  680 
  

  

  3 
  Stiff 
  mud, 
  side 
  cut, 
  repressed, 
  buff. 
  Glens 
  

  

  Falls 
  104 
  360 
  6 
  510 
  

  

  4 
  Soft 
  mud, 
  repressed 
  red 
  brick. 
  Glens 
  Falls.. 
  117 
  100 
  5 
  366 
  

   6. 
  Dry 
  pressed 
  buff 
  brick. 
  Glens 
  Falls 
  83 
  680 
  6 
  800 
  

  

  6 
  Soft 
  mud 
  brick, 
  W. 
  W. 
  Parry, 
  Kome 
  115 
  300 
  4 
  470 
  

  

  7 
  Stiff 
  mud, 
  repressed, 
  W. 
  W. 
  Parry, 
  Rome.. 
  240 
  000 
  8 
  760 
  

  

  