﻿CAL. 
  ACAD. 
  SCIENCES. 
  

  

  IMPROVED 
  METHOD 
  OF 
  OBSERVING 
  ALTITUDES 
  OF 
  THE 
  SUN 
  AT 
  SEA, 
  LOWRY. 
  

  

  (TO 
  FACE 
  PAGE 
  310.) 
  

  

  