﻿I06 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  having 
  the 
  darabihty 
  to 
  support 
  heavy 
  traffic 
  for 
  a 
  long 
  time, 
  can 
  be 
  

   cheaply 
  renewed 
  if 
  the 
  source 
  of 
  supply 
  is 
  not 
  far 
  distant. 
  This 
  fact 
  has 
  

   been 
  recognized 
  for 
  a 
  long 
  time 
  at 
  points 
  within 
  easy 
  reach 
  of 
  the 
  lime- 
  

   stone 
  quarries. 
  In 
  Onondaga 
  county 
  at 
  many 
  points 
  a 
  portable 
  crusher 
  

   has 
  been 
  used 
  to 
  crush 
  for 
  road 
  metal 
  the 
  blocks 
  from 
  the 
  limestone 
  

   fences 
  which 
  are 
  cheerfully 
  donated 
  by 
  the 
  residents 
  for 
  the 
  improve- 
  

   ment 
  of 
  the 
  roads. 
  There 
  are 
  many 
  other 
  counties 
  in 
  which 
  this 
  might 
  

   be 
  done 
  as 
  may 
  be 
  seen 
  from 
  the 
  map 
  which 
  shows 
  the 
  distribution 
  of 
  

   the 
  limestone 
  areas. 
  In 
  most 
  of 
  these 
  areas 
  limestone 
  will 
  be 
  found 
  in 
  

   the 
  fences 
  and 
  may 
  be 
  crushed 
  for 
  road 
  metal 
  at 
  small 
  expense. 
  

  

  The 
  lists 
  of 
  quarrymen 
  and 
  the 
  maps 
  at 
  the 
  end 
  of 
  this 
  bulletin 
  explain 
  

   the 
  distribution 
  of 
  materials 
  available 
  for 
  road 
  building. 
  

  

  The 
  distribution 
  of 
  road 
  materials 
  may 
  also 
  be 
  studied 
  in 
  greater 
  detail 
  

   on 
  the 
  Economic 
  Map 
  of 
  New 
  York 
  by 
  F. 
  J. 
  H. 
  Merrill 
  which 
  shows 
  

   both 
  the 
  geology 
  and 
  the 
  mineral 
  deposits 
  on 
  a 
  scale 
  of 
  12 
  miles 
  to 
  

   I 
  inch 
  and 
  on 
  the 
  Preliminary 
  Geologic 
  Map 
  of 
  New 
  York 
  by 
  the 
  State 
  

   Geologist 
  which 
  shows 
  the 
  geology 
  on 
  a 
  scale 
  of 
  5 
  miles 
  to 
  i 
  inch.| 
  

  

  In 
  addition^to 
  the 
  outcrops 
  and 
  ledges 
  where 
  quarries 
  may 
  be 
  opened 
  

   the 
  deposits 
  of 
  boulders 
  and 
  gravel 
  whrch 
  we 
  call 
  glacial 
  drift 
  often 
  yield 
  

   good 
  materials 
  for 
  road 
  metal 
  at 
  a 
  long 
  distance 
  from 
  the 
  original 
  source. 
  

   These 
  deposits 
  cannot 
  as 
  yet 
  be 
  mapped 
  but 
  they 
  are 
  usually 
  well 
  known 
  

   in 
  the 
  regions 
  where 
  they 
  occur. 
  

  

  Tests 
  of 
  Road 
  Material 
  

  

  The 
  most 
  practical 
  test 
  of 
  road 
  metal 
  is 
  actual 
  use, 
  and 
  this 
  has 
  been 
  

   the 
  principal 
  guide 
  in 
  the 
  past 
  ; 
  but 
  as 
  the 
  demand 
  becomes 
  greater 
  for 
  

   new 
  localities 
  of 
  road 
  metal 
  in 
  order 
  to 
  reduce 
  transportation 
  charges, 
  it 
  

   has 
  become 
  necessary 
  to 
  devise 
  physical 
  tests 
  which 
  may 
  be 
  used 
  in 
  the 
  

   examination 
  of 
  new 
  materials 
  offered 
  for 
  road 
  building. 
  

  

  The 
  following 
  description 
  quoted 
  from 
  the 
  report 
  of 
  the 
  Massachusetts 
  

   Highway 
  Commission 
  for 
  1896, 
  describes 
  in 
  detail 
  the 
  methods 
  in 
  use 
  by 
  

   that 
  organization.* 
  f 
  

  

  LABORATORY 
  EXPERIMENTS 
  ON 
  ROADBUILDING 
  STONES 
  

  

  The 
  following 
  described 
  results 
  were 
  obtained 
  in 
  the 
  highway 
  labora- 
  

   tory 
  of 
  the 
  engineering 
  department 
  of 
  the 
  Lawrence 
  Scientific 
  School 
  ot 
  

   Harvard 
  University. 
  Those 
  under 
  the 
  head 
  ' 
  Coefficient 
  of 
  abrasion 
  

   were 
  obtained 
  by 
  the 
  Deval 
  method, 
  which 
  has 
  been 
  employed 
  for 
  some 
  

   time 
  by 
  the 
  French 
  engineers 
  for 
  determining 
  the 
  relative 
  value 
  of 
  the 
  

  

  * 
  Pp. 
  86-91. 
  I- 
  In 
  this 
  quotation, 
  metric 
  weights 
  and 
  measures 
  have 
  been 
  reduced 
  to 
  common 
  

  

  °±Tor 
  Westchester 
  Co. 
  see 
  A 
  Geological 
  Map 
  of 
  a 
  Part 
  of 
  Southeastern 
  New 
  York 
  by 
  F. 
  J. 
  H. 
  

   Merrill, 
  in 
  Bulletin 
  15, 
  N. 
  Y. 
  State 
  Museum; 
  also 
  in 
  48th 
  Ann. 
  Rept. 
  N. 
  Y. 
  State 
  Museum. 
  

  

  