﻿260 
  

  

  A. 
  M. 
  Mayer— 
  On 
  the 
  Flotation 
  of 
  

  

  Experiments 
  on 
  Disk 
  No. 
  1. 
  Temp. 
  18°. 
  

  

  Diameter 
  of 
  disk 
  5-09 
  cm 
  

  

  Thickness 
  of 
  disk 
  - 
  0-1 
  cm 
  

  

  

  w 
  

  

  h 
  

  

  1) 
  

  

  11*327 
  grams. 
  

  

  0-502 
  centimeter. 
  

   •483 
  

  

  2) 
  

  

  •272 
  

  

  •507 
  

  

  •489 
  

  

  3) 
  

  

  •333 
  

  

  •507 
  max. 
  

   •500 
  

  

  4) 
  

  

  •335 
  

  

  •497 
  

   •500 
  

  

  5) 
  

  

  •185 
  min. 
  

  

  •481 
  min. 
  

   •505 
  

  

  6) 
  

  

  •287 
  

  

  •500 
  

   •506 
  

  

  *) 
  

  

  •380 
  

  

  •500 
  

   •489 
  

  

  8) 
  

  

  •276 
  

  

  •425 
  max. 
  

  

  •498 
  

  

  9) 
  

  

  0-497 
  = 
  mean. 
  

  

  

  ll-313=mean. 
  

  

  . 
  

  

  In 
  the 
  experiments 
  on 
  W 
  the 
  mean 
  of 
  the 
  difference 
  of 
  the 
  

   maximum 
  and 
  minimum 
  measures 
  from 
  the 
  mean 
  is 
  *12, 
  and 
  

  

  • 
  12 
  i 
  

  

  — 
  — 
  — 
  = 
  — 
  ; 
  while 
  in 
  the 
  measures 
  of 
  h 
  we 
  have 
  the 
  mean 
  of 
  

  

  the 
  difference 
  of 
  the 
  maximum 
  and 
  minimum 
  measures 
  from 
  

  

  the 
  mean 
  equal 
  to 
  '013, 
  and 
  — 
  — 
  = 
  — 
  . 
  The 
  knowledge 
  of 
  

  

  the 
  upward 
  hydrostatic 
  pressure 
  on 
  the 
  disk, 
  so 
  important 
  in 
  

   the 
  deduction 
  of 
  the 
  value 
  of 
  the 
  tension 
  from 
  the 
  equation 
  

   W=P-fT, 
  seems 
  to 
  be 
  uncertain, 
  and 
  it 
  is 
  not 
  to 
  be 
  expected 
  

   that 
  experiments 
  with 
  disks 
  can 
  give 
  accurate 
  value 
  of 
  T. 
  

  

  On 
  the 
  form 
  of 
  the 
  depressed 
  loater-surface. 
  

  

  To 
  compute 
  the 
  tension 
  in 
  the 
  plane 
  tangential 
  to 
  the 
  water- 
  

   surface, 
  along 
  the 
  circumference 
  of 
  .the 
  upper 
  edge 
  of 
  the 
  

   disk, 
  it 
  is 
  necessary 
  to 
  know 
  the 
  angle 
  that 
  the 
  depressed 
  

   water, 
  along 
  this 
  edge, 
  forms 
  with 
  a 
  vertical 
  to 
  this 
  edge. 
  The 
  

   contour 
  of 
  the 
  depressed 
  surface 
  was 
  obtained 
  in 
  the 
  following 
  

   manner. 
  A 
  rod, 
  R, 
  tig. 
  2, 
  was 
  fastened 
  at 
  right 
  angles 
  to 
  the 
  

   plane 
  of 
  a 
  square 
  plate, 
  P, 
  of 
  aluminum 
  0'l 
  cm 
  thick. 
  This 
  rod 
  

  

  