﻿CLAYS 
  OF 
  ]S^EW 
  YOKK 
  843 
  

  

  'No. 
  1 
  furnished 
  by 
  P. 
  H. 
  Eankel. 
  

  

  Xo. 
  2 
  Chemistry 
  of 
  pottery, 
  p. 
  38. 
  C. 
  Langenbeck 
  analyst. 
  

  

  Otber 
  quarriee 
  occur 
  in 
  the 
  "vicinity 
  of 
  Bedford, 
  on 
  the 
  farm 
  of 
  

   A. 
  Hobby, 
  and 
  L. 
  McDonald, 
  but 
  their 
  output 
  is 
  not 
  constant. 
  

  

  Though 
  in 
  ISTew 
  York 
  the 
  quartz 
  and 
  feldspar 
  are 
  found 
  in 
  the 
  

   same 
  veins, 
  still 
  at 
  many 
  localities 
  they 
  occur 
  alone, 
  but 
  in 
  every 
  

   case 
  the 
  vein 
  is 
  found 
  in 
  metamorphic 
  rocks. 
  

  

  Preparation. 
  The 
  quartz 
  and 
  feldspar 
  are 
  quarried 
  in 
  the 
  usual 
  

   way 
  by 
  blasting, 
  and 
  after 
  sorting 
  when 
  this 
  is 
  necessary, 
  they 
  are 
  

   ground 
  in 
  a 
  buhr 
  stone 
  mill, 
  similar 
  to 
  that 
  shown 
  in 
  plate. 
  This 
  

   reduces 
  the 
  material 
  to 
  a 
  condition 
  of 
  fine 
  sand, 
  after 
  which 
  it 
  is 
  

   put 
  in 
  a 
  ball 
  mill, 
  with 
  rolled 
  flint 
  pebbles, 
  and 
  ground 
  for 
  about 
  

   six 
  hours, 
  the 
  resulting 
  product 
  being 
  a 
  very 
  fine 
  powder, 
  which 
  is 
  

   shipped. 
  

  

  Uses 
  of 
  feldspar. 
  Feldspar 
  is 
  used 
  to 
  a 
  large 
  extent 
  as 
  a 
  fluxing 
  

   material 
  in 
  the 
  manufacture 
  of 
  white 
  earthenware, 
  and 
  porcelain 
  

   bodies, 
  and 
  is 
  also 
  one 
  of 
  the 
  ingredients 
  of 
  the 
  glaze 
  for 
  hard 
  porce- 
  

   lain. 
  In 
  addition 
  it 
  has 
  also 
  found 
  some 
  use 
  as 
  a 
  constituent 
  of 
  

   glass, 
  the 
  feldspar 
  furnishing 
  the 
  necessary 
  amount 
  of 
  alumina 
  for 
  

   the 
  purpose 
  of 
  hardening 
  the 
  product 
  and 
  as 
  a 
  wood-filler. 
  

  

  Uses 
  of 
  quartz. 
  Quartz 
  is 
  also 
  used 
  as 
  an 
  ingredient 
  of 
  pottery 
  

   for 
  the 
  purpose 
  of 
  counteracting 
  fire 
  shrinkage, 
  and, 
  in 
  addition 
  

   to 
  its 
  uses 
  in 
  this 
  direction, 
  powdered 
  quartz 
  finds 
  application 
  in 
  a 
  

   number 
  of 
  other 
  branches 
  of 
  the 
  industrial 
  arts. 
  Much 
  of 
  the 
  

   quartz 
  produced 
  in 
  this 
  country 
  is 
  mixed 
  with 
  oil, 
  and 
  is 
  used 
  as 
  

   a 
  wood-filler 
  in 
  painting. 
  That 
  utilized 
  for 
  this 
  purpose 
  is 
  ground 
  

   as 
  finely 
  as 
  the 
  quartz 
  consumed 
  by 
  the 
  potters. 
  It 
  is 
  also 
  em- 
  

   ployed 
  in 
  the 
  manufacture 
  of 
  sand 
  paper, 
  ;powders 
  and 
  scouring 
  soaps 
  

   and 
  glass 
  manufacture. 
  

  

  The 
  entire 
  output 
  of 
  the 
  quarries 
  at 
  Bedford 
  is 
  hauled 
  to 
  Bed- 
  

   ford 
  Station, 
  and 
  shipped 
  from 
  there 
  to 
  the 
  potteries 
  at 
  Trenton. 
  

  

  The 
  prices 
  obtained 
  for 
  both 
  quartz 
  and 
  feldspar 
  vary 
  naturally 
  

   with 
  the 
  grade 
  of 
  the 
  material, 
  and 
  also 
  the 
  supply 
  and 
  demand. 
  

   Ground 
  spar 
  at 
  Trenton 
  brings 
  about 
  $7 
  a 
  ton, 
  while 
  ground 
  

  

  