﻿E. 
  Eidicell 
  — 
  Improved 
  Bock 
  Cutter 
  and 
  Trimmer. 
  419 
  

  

  If 
  very 
  rapid 
  work 
  is 
  desired 
  any 
  of 
  the 
  various 
  forms 
  of 
  

   quick-acting 
  vise 
  might 
  be 
  employed 
  as 
  a 
  basis 
  for 
  the 
  machine, 
  

   but 
  I 
  do 
  not 
  think 
  the 
  change 
  would 
  be 
  a 
  good 
  one. 
  The 
  

   quick-acting 
  vises 
  are 
  provided 
  with 
  weaker 
  screws, 
  and 
  the 
  

   parallel 
  bars 
  are 
  invariably 
  of 
  cast 
  iron, 
  cored 
  hollow, 
  and 
  

   sadly 
  deficient 
  in 
  strength, 
  hence 
  a 
  cutter 
  made 
  from 
  a 
  vise 
  of 
  

   this 
  kind 
  would 
  be 
  liable 
  to 
  complete 
  collapse 
  when 
  used 
  for 
  

   heavy 
  work. 
  No 
  matter 
  what 
  form 
  of 
  vise 
  is 
  used, 
  if 
  the 
  

   machine 
  is 
  to 
  be 
  satisfactory 
  it 
  is 
  absolutely 
  essential 
  that 
  the 
  

   screw 
  be 
  accurately 
  cut, 
  to 
  prevent 
  lost 
  motion, 
  and 
  that 
  each 
  

   cutter 
  be 
  carefully 
  fitted 
  to 
  its 
  seat, 
  shaped 
  so 
  that 
  cutting 
  

   edges 
  will 
  exactly 
  meet 
  when 
  brought 
  together, 
  and 
  be 
  made 
  

   of 
  the 
  very 
  best 
  tool 
  steel, 
  properly 
  tempered. 
  If 
  these 
  pre- 
  

   cautions 
  are 
  taken, 
  the 
  result 
  will 
  be 
  a 
  machine 
  that 
  is 
  free 
  

   from 
  every 
  trace 
  of 
  ricketiness, 
  and 
  amply 
  able 
  to 
  stand 
  up 
  to 
  

   any 
  work 
  that 
  can 
  be 
  put 
  on 
  it. 
  During 
  the 
  last 
  year 
  the- 
  

   Michigan 
  Geological 
  Survey 
  has 
  made 
  with 
  one 
  pair 
  of 
  jaws 
  

   from 
  2500 
  to 
  3000 
  cuts, 
  on 
  such 
  specimens 
  as 
  conglomerates, 
  

   sandstones, 
  amygdaloids, 
  traps, 
  felsites, 
  porphyries, 
  silicified 
  

   tufas, 
  prehnite 
  and 
  datolite 
  veinstone 
  with 
  copper, 
  and 
  its 
  jaws 
  

   show 
  practically 
  no 
  signs 
  of 
  wear 
  on 
  the 
  cutting 
  edges. 
  

  

  Fig. 
  3 
  shows 
  the 
  machine 
  ready 
  for 
  use. 
  

  

  Fig. 
  3. 
  

  

  In 
  conclusion 
  I 
  would 
  state 
  that 
  none 
  of 
  the 
  features 
  here 
  

   mentioned 
  are 
  patented, 
  and 
  are 
  free 
  to 
  all 
  who 
  may 
  care 
  to 
  

   use 
  them. 
  The 
  complete 
  machine, 
  from 
  my 
  drawings, 
  can 
  be 
  

   got 
  of 
  Merrill 
  Brothers, 
  465 
  Kent 
  ave., 
  Brooklyn, 
  N. 
  Y. 
  

  

  Michigan 
  Mining 
  School, 
  Houghton, 
  Michigan. 
  

  

  