120 



DETERMINATION OF ALTITUDES BY BAROMETER. 



The following example is introduced to illustrate the method of computation above described 



EXAMPLE. 

 Data for determining the altitude of Camp 22, near upper end of upper canon of Pit river. 



Corrections applied before computation. 



Mean of corrected readings, 25.981 inches. 



Mean daily air temperature, about 67 Fahrenheit. 



Computation by Loomis tables. 



H = so. 057 



H m25. 981 



f = 67 



Part I gives for 



H 30.057 



27659.2 



H 25. 981 . 23851.8 



Approximate altitude a .......................... _____ _____ 3807. 4 



900 



900 



Second approximate altitude A 4090. 8 



Part III gives for A = 4090.8 and L = 41 50 1. 8 



Part IV gives for A 4090. 8 H. 1 



Altitude of station in feet . 4103.7 



