﻿754 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  of 
  material 
  that 
  would 
  be 
  lost 
  from 
  a 
  square 
  yard 
  of 
  pavement 
  laid 
  

   in 
  the 
  street. 
  

  

  Mr 
  Jones 
  gives 
  the 
  following 
  test 
  made 
  at 
  Geneva. 
  16 
  different 
  

   samples 
  were 
  at 
  his 
  disposal; 
  in 
  order 
  to 
  eliminate 
  the 
  weakest, 
  he 
  

   put 
  two 
  of 
  each 
  kind 
  of 
  brick 
  into 
  the 
  staves 
  of 
  the 
  machine, 
  with 
  

   the 
  usual 
  charge 
  and 
  number 
  of 
  revolutions. 
  The 
  result 
  was 
  that, 
  

   while 
  the 
  strongest 
  jnaterial 
  lost 
  less 
  than 
  3^, 
  the 
  weakest 
  lost 
  

   7.35^. 
  The 
  wire-cut 
  brick 
  failed 
  to 
  develop 
  as 
  much 
  strength 
  

   as 
  the 
  same 
  material 
  repressed. 
  In 
  one 
  instance, 
  the 
  difference 
  of 
  

   abrasion 
  was 
  as 
  between 
  3.59^ 
  in 
  the 
  case 
  of 
  repressed 
  brick 
  and 
  

   6.2 
  6,^^ 
  for 
  common 
  wire-cut 
  brick. 
  The 
  large 
  fire 
  clay 
  blocks 
  also 
  

   failed 
  in 
  comparison 
  with 
  the 
  smaller 
  repressed 
  fire 
  clay 
  bricks. 
  

  

  Some 
  of 
  the 
  comparative 
  results 
  reached 
  by 
  Mr 
  Jones's 
  test 
  were 
  

   as 
  follows: 
  

  

  Abrasive 
  

   loss 
  

  

  Shale 
  block 
  no. 
  1 
  2.46^ 
  

  

  Medina 
  sandstone 
  block 
  3.61^ 
  

  

  Eire 
  clay 
  block 
  no. 
  2 
  3.2.^ 
  

  

  Fire 
  clay 
  block 
  no. 
  3 
  4. 
  6/^ 
  

  

  The 
  method 
  adopted 
  by 
  Mr 
  Jones 
  is 
  undoubtedly 
  from 
  all 
  ap- 
  

   pearances 
  very 
  reasonable, 
  but, 
  in 
  order 
  to 
  determine 
  whether 
  it 
  

   or 
  the 
  old 
  method 
  of 
  testing 
  the 
  resistance 
  of 
  brick 
  to 
  abrasion 
  

   is 
  the 
  better, 
  it 
  will 
  be 
  necessary 
  to 
  carry 
  on 
  a 
  long 
  series 
  of 
  parallel 
  

   tests 
  on 
  the 
  same 
  material, 
  using 
  both 
  methods. 
  Steps 
  have 
  already 
  

   been 
  taken 
  to 
  do 
  this, 
  by 
  the 
  ITational 
  brickmakers 
  association. 
  

  

  More 
  recently 
  Prof. 
  Talbot 
  of 
  the 
  University 
  of 
  Illinois 
  has 
  

   brought 
  forth 
  a 
  third 
  method 
  of 
  testing 
  paving 
  brick 
  which 
  differs 
  

   from 
  the 
  standard 
  test 
  of 
  the 
  ITational 
  brickmakers 
  association 
  in 
  

   placing 
  a 
  certain 
  number 
  of 
  bricks 
  in 
  the 
  standard 
  E". 
  B. 
  M. 
  A. 
  

   rattler, 
  along 
  with 
  cast 
  iron 
  shot 
  of 
  two 
  sizes, 
  the 
  larger 
  weighing 
  

   about 
  Y-J 
  pounds, 
  the 
  smaller 
  about 
  1 
  pound. 
  

  

  A 
  committee 
  lately 
  appointed 
  by 
  the 
  association 
  referred 
  to 
  

   above 
  found 
  that, 
  while 
  the 
  Jones 
  device 
  gives 
  more 
  accordant 
  or 
  

  

  