BAROMETRICAL MEASUREMENT OF HEIGHTS. LOOMIS. 



App. 

 Alt. 



Feet. 



1000 



2000 



3000 



4000 



5000 



6000 



7000 



8000 



9000 



10000 



11000 



12000 



13000 



14000 



15000 



16000 



17000 



18000 



19000 



20000 



21000 



22000 



23000 



24000 



25000 



PART III. 



Correction due to the Change of Grav- 

 ity from the Latitude of 45° to tlie 

 Latitude of the Place of Observation. 

 Positive from Lat. 0° to 45° ; 

 Negative from Lat. 45° to 90°. 



Latitude. 



Qo 

 90O 



Feet. 

 2.6 

 5.3 

 7.9 

 10.6 

 13.2 

 15.9 

 18.5 

 21.2 

 23.8 

 26.5 

 29.1 

 31.8 

 34.4 

 37.1 

 39.7 

 42.4 

 45.0 

 47.7 

 50.3 

 53.0 

 55.6 

 58.3 

 60.9 

 63.6 

 66.2 



D 



Feet. 

 2.5 

 5.0 

 7.5 

 10.0 

 12.4 

 14.9 

 17.4 

 19.9 

 22.4 

 24.9 

 27.4 

 29.9 

 32.4 

 34.9 

 37.3 

 39 

 42.3 

 44.8 

 47.3 

 49.8 

 52.3 

 54.8 

 57.3 

 .59.8 

 62.2 



20O 



70O 



Feet. 



2.0 



4.1 



6.1 



8.1 



10.1 



12.2 



14.2 



16.2 



18.3 



20.3 



22.3 



24.4 



26.4 



28.4 



30.4 



32.5 



34.5 



36.5 



30O 

 60O 



Feet. 



1.3 



2.6 



4.0 



5.3 



6.6 



7.9 



9.3 



10.6 



11.9 



13.2 



14.6 



15.9 



17.2 



18.5 



19.9 



21.2 



22.5 



23.8 



38.6 25.2 



40.6 26.5 



42.6 27.8 



44.7 29.1 

 46.7 30.5 

 48.7' 31.8 

 50.7 33.1 



40O 



50O 



Feet. 

 0.5 

 0.9 

 1.4 

 1.8 

 2.3 

 2.8 

 3.2 

 3.7 

 4.1 

 4.6 

 5.1 

 5.5 

 6.0 

 6.4 

 6.9 

 7.4 

 7.8 

 8.3 

 8.7 

 9.2 

 9.7 

 10.1 

 10.6 

 11.0 

 11.5 



450 



Feet. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



PART 

 IV. 



Correction 



for 

 Decrease 

 of Gravity 



on a 

 Vertical. 



Alivays 

 Positive. 



Feet. 

 2.5 

 5.2 

 7.9 

 10.8 

 13.7 

 16.7 

 19.9 

 23.1 

 26.4 

 29.8 

 33.3 

 36.9 

 40.6 

 44.4 

 48.3 

 52.3 

 56.4 

 60.5 

 64.8 

 69.2 

 73.6 

 78.2 

 82.9 

 87.6 

 92.5 



53 



PART V. 



Correction due to the Height of the Lower 

 Station. 



Always Positive. 



Height of Barometer at Lower Station. 



Feet. 

 0.2 

 0.3 

 0.5 

 0.7 

 0.8 

 1.0 

 1.2 

 1.3 

 1.5 

 1.7 

 1.8 

 2.0 

 2.2 

 2.3 

 2.5 

 2.7 

 2.8 

 3.0 

 3.2 

 3.3 

 3.5 

 3.7 

 3.8 

 4.0 

 4.1 



App- 

 Alt. 



Feet. 



1000 



2000 



3000 



4000 



5000 



6000 



7000 



SOOO 



9000 



10000 



11000 



12000 



1.3000 



14000 



15000 



16000 



17000 



18000 



19000 



20000 



21000 



22000 



23000 



24000 



25000 



