﻿Commissioner 
  of 
  Agriculture. 
  

  

  481 
  

  

  A 
  TABLE 
  SHOWING 
  THE 
  CORRECTION 
  FOR 
  TEMPERATURE 
  to 
  be 
  

  

  added 
  or 
  subtracted 
  from 
  the 
  readings 
  of 
  a 
  glass 
  hydrometer, 
  cor- 
  

   rect 
  at 
  60° 
  F. 
  (15°. 
  5 
  C.) 
  immersed 
  in 
  linseed 
  oil, 
  for 
  each 
  degree 
  

   from 
  40° 
  F. 
  to 
  85° 
  F. 
  

  

  Calculated 
  from 
  the 
  results 
  obtained 
  in 
  determining 
  the 
  specific 
  

   gravity 
  of 
  samples, 
  Nos. 
  88, 
  90, 
  92, 
  94 
  and 
  95, 
  by 
  the 
  following 
  

   formula. 
  

  

  Let 
  a 
  = 
  weig-ht 
  of 
  oil 
  displaced 
  by 
  glass 
  plummet 
  at 
  15°. 
  5 
  C, 
  let 
  

   b 
  = 
  weight 
  of 
  oil 
  displaced 
  by 
  glass 
  plummet 
  at 
  28°.0 
  C, 
  let 
  c 
  = 
  

   weig-ht 
  of 
  water 
  displaced 
  by 
  glass 
  plummet 
  at 
  15°. 
  5 
  C, 
  let 
  d 
  = 
  

   difference 
  in 
  apparent 
  gravity 
  by 
  hydrometer 
  for 
  1°. 
  

   a 
  — 
  b 
  

  

  c 
  

  

  28 
  — 
  15.5 
  

   By 
  substituting 
  82°. 
  4 
  F. 
  and 
  60° 
  F. 
  

   the 
  correction 
  will 
  be 
  found 
  for 
  1° 
  F. 
  

   Correction 
  for 
  1° 
  Fahr. 
  = 
  .000361. 
  

   Correction 
  for 
  1° 
  C. 
  = 
  .000650. 
  

  

  for 
  28° 
  C. 
  in 
  the 
  formula 
  

  

  31 
  

  

  