﻿574 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  copied 
  from 
  "The 
  Mineral 
  Industry," 
  K. 
  P. 
  Rothwell, 
  E. 
  M., 
  

   editor, 
  shows 
  the 
  composition 
  of 
  the 
  hydraulic 
  limestones 
  of 
  the 
  

   United 
  States 
  : 
  

  

  

  o 
  © 
  

  

  , 
  "O 
  

  

  is 
  n 
  

  

  a, 
  » 
  

  

  r- 
  o 
  

  

  45.91 
  

   2^.14 
  

  

  15.37 
  

  

  11.38 
  

  

  c"2 
  

  

  50.82 
  

   17.74 
  

   22.66 
  

  

  2.39 
  

   4.37 
  

   0.55 
  

   Traces 
  

   0.99 
  

   0.4~ 
  

  

  I 
  

  

  © 
  

  

  © 
  

  

  IS 
  

  

  s 
  

  

  EM 
  

  

  c3 
  

  

  So 
  

  

  © 
  

  

  D 
  

  

  «3 
  

   Ah 
  

  

  © 
  

   'u 
  

  

  55 
  

  

  Pi 
  

  

  ft 
  

  

  o 
  

   O 
  

  

  

  42.25 
  

   31.98 
  

   21.. 
  2 
  

  

  1.12 
  

  

  "s.m 
  

  

  45.54 
  

   32.46 
  

   17.56 
  

  

  4.44 
  

   "4]37 
  

  

  65.21 
  

   10.65 
  

   15.21 
  

  

  4. 
  £6 
  

   "i^KS 
  

  

  43.50 
  

   22.00 
  

   22.10 
  

  

  7.25 
  

  

  ' 
  O.'SB 
  

  

  "6.55 
  

  

  78.92 
  

   2 
  66 
  

   11.68 
  

  

  6.S5 
  

  

  67.14 
  

  

  Oari'Onnte 
  of 
  magnesia 
  

  

  Silica 
  and 
  insoluble. 
  ..... 
  

  

  fees(|Uiuxide 
  of 
  iron 
  and 
  alum- 
  

  

  2.90 
  

   18.34 
  

  

  7.49 
  

  

  Sulph-tteof 
  lime 
  

  

  Oxide 
  of 
  manganese 
  

  

  "0A9 
  

  

  

  

  

  Water 
  and 
  undetermined 
  

  

  1.20 
  

  

  3.94 
  

  

  While 
  the 
  above 
  analyses 
  show 
  a 
  rather 
  wide 
  range 
  in 
  chemical 
  

   composition, 
  one 
  fact 
  stands 
  out 
  clearly 
  that 
  a 
  natural 
  cement 
  

   rock 
  is 
  essentially 
  a 
  magnesian 
  limestone 
  with 
  a 
  rather 
  high 
  per- 
  

   centage 
  of 
  silica 
  and 
  alumnia. 
  It 
  is 
  also 
  quite 
  probable 
  that 
  a 
  

   given 
  cement 
  rock 
  bed 
  in 
  one 
  locality, 
  if 
  properly 
  mixed 
  through- 
  

   out 
  in 
  the 
  process 
  of 
  manufacture, 
  is 
  quite 
  as 
  good 
  as 
  that 
  from 
  

   another. 
  We 
  must, 
  therefore, 
  look 
  to 
  other 
  sources 
  for 
  the 
  

   extended 
  use 
  of 
  the 
  Rosendale 
  cement, 
  as 
  the 
  (-astern 
  natural 
  

   cements 
  are 
  generally 
  known. 
  First 
  of 
  all 
  will 
  come 
  the 
  experi- 
  

   ence 
  of 
  the 
  makers. 
  

  

  The 
  property 
  of 
  " 
  hydraulicity 
  " 
  was 
  first 
  discovered 
  by 
  a 
  French 
  

   engineer 
  n 
  imed 
  Yicat 
  in 
  1 
  8 
  1 
  8. 
  Fourteen 
  years 
  after 
  this 
  discovery, 
  

   or 
  in 
  1832, 
  the 
  first 
  Rosendale 
  cement 
  was 
  made 
  in 
  Ulster 
  county, 
  

   New 
  York. 
  From 
  that 
  date 
  until 
  the 
  present 
  time 
  there 
  has 
  been 
  a 
  

   constant 
  increase 
  of 
  the 
  output 
  of 
  the 
  Rosendale 
  cement. 
  In 
  1 
  882, 
  

   according 
  to 
  tne 
  " 
  Mineral 
  Resources 
  of 
  the 
  United 
  States," 
  the 
  

   Ulster 
  county 
  output 
  was 
  1,600,000 
  barrels 
  of 
  300 
  pounds 
  net. 
  

   From 
  this 
  date 
  (1882) 
  to 
  1892 
  a 
  constant 
  increase 
  is 
  shown 
  : 
  18s2, 
  

   1,600,000 
  bbls.; 
  1889,2,547,225; 
  1890,2,683,579; 
  1891,2,815,010; 
  

   1>92, 
  2,8 
  3,107. 
  The 
  total 
  product 
  of 
  1893 
  is 
  not 
  given, 
  as 
  when 
  

   the 
  statistics 
  were 
  taken 
  the 
  year's 
  output 
  had 
  not 
  been 
  summed 
  

   up. 
  The 
  accompanying 
  table 
  gives 
  the 
  estimated 
  manufacture. 
  

  

  It 
  is 
  very 
  evident, 
  however, 
  that 
  an 
  experience 
  of 
  sixty 
  -one 
  

   years 
  in 
  the 
  manufacture 
  of 
  cement 
  goes 
  a 
  long 
  way 
  in 
  explain- 
  

   ing 
  the 
  confidence 
  w 
  T 
  hich 
  engineers 
  have 
  in 
  the 
  ULter 
  county 
  

   cements. 
  

  

  