﻿BIHAXG 
  TILL 
  K. 
  SV. 
  VET.-AKAD. 
  HAXDL. 
  BAND 
  6. 
  N:0 
  21. 
  7 
  

  

  found 
  them 
  myself 
  nor 
  seen 
  tliem 
  meutioned 
  by 
  others 
  as 
  

   livins; 
  in 
  tlie 
  Baltic. 
  

  

  The 
  bottomsoil 
  specimens 
  have 
  been 
  taken 
  up 
  witli 
  an 
  

   apparatus 
  iuvented 
  by 
  Mr 
  Th. 
  Aewidsson, 
  cbief 
  of 
  the 
  Eoyal 
  

   Hydrographic 
  Department 
  of 
  Sweden 
  and 
  by 
  the 
  inventor 
  

   kindly 
  placed 
  at 
  my 
  disposal. 
  This 
  »Bottom-Specimen-Catcher» 
  

   has 
  never 
  been 
  described, 
  but 
  according 
  to 
  my 
  experience 
  

   of 
  it, 
  I 
  think 
  it 
  is 
  well 
  worth 
  of 
  being 
  more 
  commonly 
  

   known 
  and 
  used, 
  on 
  account 
  of 
  the 
  easiness 
  with 
  which 
  it 
  

   can 
  be 
  handled, 
  — 
  it 
  is 
  easily 
  managed 
  by 
  one 
  man, 
  — 
  and 
  

   of 
  the 
  very 
  good 
  result 
  with 
  which 
  it 
  works 
  wherc 
  the 
  

   bottom 
  does 
  not 
  consist 
  of 
  rock, 
  stones, 
  gravel 
  or 
  härd 
  sand. 
  

   Viith 
  the 
  permission 
  of 
  the 
  inventor 
  I 
  therefore 
  take 
  the 
  

   liberty 
  of 
  giving 
  a 
  description 
  and 
  a 
  drawing 
  of 
  it, 
  the 
  latter 
  

   made 
  by 
  the 
  care 
  of 
  the 
  inventor. 
  

  

  The 
  bottom-specimen-catcher, 
  Plate 
  IV, 
  figs. 
  I 
  — 
  III, 
  con- 
  

   sists 
  of 
  two 
  scoops 
  of 
  iron 
  plate, 
  diameter 
  about 
  20 
  cm., 
  

   shutting 
  closely 
  to 
  one 
  another 
  and 
  united 
  by 
  a 
  joint. 
  On 
  

   the 
  top 
  of 
  each 
  scoop 
  there 
  is 
  a 
  valve 
  of 
  Jeather, 
  C, 
  to 
  let 
  

   the 
  air 
  out, 
  when 
  the 
  instrument 
  is 
  going 
  down 
  in 
  the 
  water. 
  

   From 
  the 
  joint 
  a 
  chain 
  of 
  ilat 
  links, 
  D, 
  issues, 
  and 
  on 
  one 
  

   of 
  these 
  links, 
  abont 
  35 
  cm. 
  above 
  the 
  scoops, 
  there 
  is 
  a 
  

   little 
  hook, 
  E, 
  on 
  which 
  a 
  string, 
  that 
  connects 
  the 
  two 
  

   eyes, 
  F, 
  on 
  the 
  outer 
  sides 
  of 
  the 
  scoops 
  is 
  to 
  be 
  hooked. 
  

   The 
  string 
  is 
  so 
  short 
  that, 
  when 
  it 
  is 
  hooked 
  on, 
  the 
  scoops 
  

   are 
  held 
  wide 
  open. 
  At 
  the 
  middle 
  of 
  the 
  string 
  a 
  corkfloat 
  

   is 
  fastened, 
  big 
  enongh 
  to 
  hold 
  it 
  in 
  perpendicular 
  position 
  

   in 
  the 
  water, 
  when 
  it 
  is 
  not 
  hooked 
  on, 
  and 
  on 
  the 
  corkfloat 
  

   the 
  eye 
  of 
  brass 
  wire. 
  G, 
  is 
  fastened 
  by 
  which 
  the 
  string 
  is 
  

   hiing 
  on 
  the 
  hook. 
  The 
  instrument 
  is 
  lowered 
  by 
  a 
  rope, 
  

   fastened 
  to 
  the 
  end 
  of 
  the 
  chain. 
  and 
  in 
  lowering 
  has 
  the 
  

   appearanc 
  represented 
  in 
  fig. 
  I. 
  When 
  it 
  reaches 
  the 
  bottom, 
  

   it 
  sinks 
  down 
  into 
  the 
  clay 
  or 
  mud, 
  and 
  when 
  it 
  stops 
  

   sinking, 
  the 
  chain 
  with 
  the 
  hook, 
  by 
  its 
  own 
  gravity, 
  conti- 
  

   nues 
  sinking, 
  but 
  as 
  the 
  string 
  is 
  held 
  upright 
  by 
  the 
  cork- 
  

   float, 
  the 
  eye 
  slips 
  ofi" 
  from 
  the 
  hook. 
  When 
  the 
  instrument 
  

   then 
  is 
  hauled 
  up, 
  there 
  is 
  nothing 
  that 
  holds 
  the 
  scoops 
  

   apart, 
  and 
  so 
  they 
  clap 
  together 
  around 
  the 
  mud 
  or 
  clay 
  

   that 
  fills 
  up 
  their 
  interiör. 
  In 
  order 
  to 
  increase 
  the 
  weight 
  

   of 
  the 
  instrument, 
  the 
  innermost 
  part 
  of 
  the 
  scoops, 
  — 
  down 
  

   to 
  the 
  punctated 
  line 
  — 
  , 
  is 
  filled 
  with 
  lead, 
  B. 
  

  

  