ice;  its  collection,  storage  and  distribution,  217 
hinged  that  the  guide  can  be  swung  instantly  from  one  side  to 
the  other,  and  vice  versa,  at  the  pleasure  of  the  workman.  A 
staple  or  hook  is  provided,  for  attaching  a  horse.  The  prelimi- 
nary groove  having  been  made  by  the  hand  plow,  the  swing  guide 
marker  is  brought  into  use,  and,  the  guide  taking  the  groove,  the 
marker  makes  a  second  one  parallel  with  it.  Upon  turning 
around  at  the  end  of  the  course,  the  guide  is  swung  over  so  as  to 
take  the  groove  last  made  ;  and  on  the  return  trip  a  third  is 
made.  This  process  is  repeated  until  all  the  grooves  required 
are  made,  equally  distant  from,  and  parallel  with  each  other. 
If  the  ice  is  in  the  condition  alluded  to  in  the  paragraph 
.headed  "  Ice  Cutting,  &c,"  the  ice  plane  is  called  into  requisi- 
tion. This  consists  of  a  frame  formed  by  two  guides,  set  the 
normal  distance  apart,  so  that  they  will  take  the  grooves  made 
by  the  previous  instrument.  Between  these  guides  is  set  a  strong 
steel  blade,  capable  of  adjustment  at  the  will  of  the  workman, 
set  at  an  angle  like  that  of  a  carpenter's  plane,  and  which  ex- 
tends from  one  to  the  other.  A  seat  for  the  driver,  and  a  staple 
for  a  whiffle,  complete  the  machine.  The  shaving  trimmed  off 
by  this  plane  is  three  inches  thick,  and  if  clear  ice  is  not  reached 
by  once  going  over  the  surface,  a  second,  third,  and  even  a  fourth 
planing  has  occasionally  been  found  necessary  ;  that  is,  from 
three  to  twelve  inches  in  depth  has  been  planed  off  before  sound 
ice  has  been  reached. 
LARGE  ICE  PLOW.  PLOW  AND  GUIDE. 
The  right  ice  having  been  reached,  the  process  of  cutting  now 
commences  in  good  earnest.  The  hand  plow  renews  its  groove, 
and  the  swing  guide  marker  follows,  until  the  surface  has  been 
marked  as  before.  The  large  ice  plow  then  follows,  and  extends 
the  depth  of  the  grooves  already  made  to  twelve  or  fourteen 
inches.  The  large  ice  plow  is  constructed  the  same  as  the  hand 
plow,  the  difference  consisting  in  its  size,  the  double  handles,  and 
