GLASS-SAND    INDUSTRY    OF    INDIANA,   KENTUCKY,  AND    OHIO.       375 
then  is  pumped  through  a  delivery  pipe  to  various  places  in  the 
large  drain  room.  The  floor  of  this  room  is  constructed  of  coarsely 
crushed  rock  covered  by  mineral  wool.  The  sand  is  dried  in  a  sta- 
tionary roaster,  the  essential  parts  of  which  are  (1)  an  uncovered 
oblong,  iron  box,  roughly  estimated  at  7  feet  -wide,  25  feet  long,  and 
2  feet  deep,  fitted  with  a  bottom  of  grate  bars;  (2)  a  fire  box  directly 
below  the  grate,  but  separated  from  it  by  a  slanting  sheet  or  plate  of 
iron. 
The  sand  is  dropped  from  the  belt  into  the  open  box,  the  capacity 
of  which  is  about  25  tons.  While  drying  it  sifts  slowly  through  the 
grate  at  the  rate  of  3  tons  an  hour,  falls  on  the  hot,  inclined  plate 
above  the  fire,  and  slides  out  onto  a  screw  conveyer  which  operates 
in  front  of  and  at  the  base  of  the  drier.  After  one  more  screening 
the  sand  is  stored  ready  for  shipment. 
Glass  sand  is  reported  to  be  produced  at  Leavittsburg,  Trumbull 
County,  about  10  miles  northwest  of  the  Austintown  quarries. 
Undeveloped  sand. — Sandstones  as  yet  undeveloped,  but  known 
to  be  suitable  for  glass  making  and  for  other  purposes  for  which  a 
high-grade  sand  is  in  demand,  occur  in  Holmes,  Jackson,  Knox, 
Licking,  and  Muskingum  counties,  mainly  in  the  "Coal  Measures"  or 
Sharon  conglomerate  area  of  the  State. 
CHEMICAL  ANALYSES. 
The  analyses  here  tabulated  represent  for  the  most  part  the  best 
product  from  each  locality.  The  only  criticism  that  might  be  offered 
is  that  analyses  are  usually  made  from  small  selected  samples  and  do 
not  represent  average  carload  lots.  Samples  taken  from  the  cars 
invariably  show  slightly  greater  percentages  of  impurities. 
