﻿FISHERY 
  INDUSTRIES. 
  91 
  

  

  The 
  sanitary 
  can 
  is 
  readily 
  distinguishable 
  by 
  the 
  apparent 
  absence 
  of 
  

   solder 
  in 
  the 
  seams 
  and 
  the 
  real 
  absence 
  of 
  the 
  one 
  or 
  two 
  dots 
  of 
  solder 
  

   which 
  are 
  to 
  be 
  found 
  on 
  one 
  of 
  the 
  ends 
  of 
  the 
  tins 
  packed 
  under 
  other 
  

   methods. 
  As 
  a 
  matter 
  of 
  fact, 
  the 
  long 
  side 
  seam 
  of 
  the 
  sanitary 
  can 
  is 
  

   treated 
  with 
  both 
  solder 
  and 
  flux, 
  the 
  latter 
  usually 
  of 
  an 
  acid 
  char- 
  

   acter, 
  but 
  inasmuch 
  as 
  a 
  properly 
  made 
  can 
  will 
  have 
  no 
  trace 
  of 
  

   either 
  solder 
  or 
  flux 
  on 
  the 
  inside, 
  to 
  all 
  essential 
  purposes 
  it 
  is 
  a 
  

   solderless 
  and 
  acidless 
  container. 
  The 
  tops 
  and 
  bottoms 
  are 
  merely 
  

   crimped 
  on 
  without 
  acid 
  or 
  solder 
  by 
  machines 
  called 
  "double 
  

   seamers," 
  because 
  they 
  fold 
  the 
  flanges 
  of 
  side 
  and 
  end 
  over 
  twice 
  in 
  

   the 
  crimping 
  process. 
  

  

  The 
  cans 
  used 
  in 
  the 
  old-style 
  and 
  modifled 
  systems 
  are 
  identical 
  

   in 
  character, 
  solder 
  and 
  flux 
  being 
  used 
  in 
  side, 
  top, 
  and 
  bottom 
  seams. 
  

   There 
  is 
  no 
  difference 
  whatever 
  in 
  the 
  container 
  before 
  it 
  is 
  filled. 
  

   They 
  may 
  be 
  distinguished 
  from 
  each 
  other 
  by 
  the 
  solder 
  dots 
  which 
  

   are 
  to 
  be 
  found 
  on 
  one 
  end 
  of 
  the 
  can. 
  A 
  single 
  dot 
  in 
  the 
  center 
  may 
  

   denote 
  a 
  can 
  which 
  has 
  been 
  processed 
  under 
  the 
  modified 
  method, 
  

   while 
  two 
  solder 
  dots 
  indicate 
  the 
  old-style 
  process. 
  

  

  Most 
  all 
  of 
  the 
  sanitary 
  cans 
  used 
  in 
  southeast 
  Alaska, 
  and 
  to 
  a 
  

   certain 
  extent 
  in 
  the 
  more 
  remote 
  sections 
  of 
  the 
  Territory, 
  are 
  

   manufactured 
  in 
  the 
  States 
  and 
  shipped 
  empty 
  to 
  Alaska 
  in 
  the 
  

   same 
  cases 
  in 
  which, 
  at 
  the 
  rate 
  of 
  48 
  each, 
  they 
  are 
  subsequently 
  

   returned 
  filled 
  with 
  salmon. 
  The 
  bulk 
  of 
  the 
  empty 
  cans 
  thus 
  makes 
  

   the 
  freight 
  rates 
  disproportionate 
  with 
  the 
  weight 
  involved. 
  To 
  re- 
  

   duce 
  this 
  item 
  of 
  expense, 
  one 
  of 
  the 
  large 
  can 
  companies 
  has 
  lately 
  

   perfected 
  plans 
  and 
  machinery 
  to 
  collaps(i 
  the 
  body 
  of 
  the 
  can 
  so 
  that 
  

   400 
  may 
  be 
  packed 
  in 
  the 
  ordinary 
  48 
  1 
  -pound 
  tall 
  salmon 
  case. 
  

   Upon 
  arrival 
  at 
  destination 
  the 
  collapsed 
  bodies 
  are 
  run 
  through 
  a 
  

   simple 
  reshaping 
  machine 
  at 
  the 
  rate 
  of 
  about 
  70 
  per 
  minute, 
  and 
  the 
  

   bottoms 
  may 
  then 
  be 
  put 
  on 
  in 
  the 
  same 
  manner 
  as 
  are 
  tho 
  tops. 
  It 
  

   will 
  be 
  seen 
  that 
  in 
  shipment 
  the 
  collapsed 
  cans 
  require 
  only 
  about 
  

   one-sixth 
  of 
  the 
  cubical 
  space 
  as 
  compared 
  with 
  cans 
  in 
  the 
  round 
  at 
  

   the 
  rate 
  of 
  48 
  to 
  the 
  case. 
  One 
  cannery 
  man 
  in 
  southeast 
  Alaska, 
  

   figuring 
  conservatively, 
  says 
  that 
  using 
  the 
  collapsible 
  cans 
  on 
  a 
  

   30,000-case 
  pack 
  he 
  can 
  effect 
  a 
  saving 
  of 
  $2,000 
  a 
  season 
  on 
  the 
  

   basis 
  of 
  present 
  freight 
  rates. 
  

  

  Another 
  change 
  which 
  is 
  being 
  developed 
  in 
  the 
  manufacture 
  of 
  

   sanitary 
  cans 
  is 
  the 
  use 
  of 
  a 
  paper 
  gasket 
  to 
  effectuate 
  a 
  tight 
  joint, 
  

   instead 
  of 
  tho 
  rubber-like 
  compound 
  generally 
  used 
  heretofore. 
  The 
  

   paper 
  form 
  is 
  said 
  to 
  be 
  a 
  decided 
  improvement. 
  

  

  Lacquering. 
  — 
  The 
  amount 
  of 
  solder 
  or 
  acid 
  left 
  on 
  the 
  inside 
  of 
  

   the 
  long 
  body-seam 
  of 
  properly 
  made 
  old-style 
  cans 
  is 
  so 
  trifling 
  as 
  

   to 
  be 
  practically 
  negligible, 
  and 
  the 
  quantity 
  which 
  finds 
  its 
  way 
  

   within 
  through 
  either 
  of 
  the 
  end 
  seams 
  is 
  equally 
  insignificant, 
  but 
  the 
  

  

  