INSTRUCTIONS FOR ICE OBSERVATION. 



Treasury Department, 

 United States Coast Guard, 



Washington, January 6, 1922. 

 To the Commanding Officer, Coast Guard Cutter " Seneca' \- 



1. Prepare the Seneca for duty in connection with the International 

 Ice Observation. On February 5, 1922, the Seneca is detached from 

 the New York division, and assigned to independent duty Interna- 

 tional Ice Observation, with headquarters at New York, N. Y. 

 The Seneca will sail from New York, February 5, 1922, or as soon 

 thereafter as practicable, and proceed to the Grand Banks of New- 

 foundland and locate the ice fields and positions of the icebergs, 

 thereafter keeping in touch with the ice situation, making such 

 observations as practicable on the quantities of ice, its kind, extent, 

 and drift, and obtaining such information as may seem to be of value. 



2. The service to be performed is primarily the ascertainment of 

 the locations and the progressive movement of the limiting lines of the 

 regions in which icebergs and field ice exist in the vicinity of the 

 Grand Banks of Newfoundland, and the dissemination of the informa- 

 tion so ascertained for the guidance and warning of navigators; and, 

 coordinately with these primary duties, the making of such oceano- 

 graphical and meteorological observations as will form a contribution 

 toward the knowledge of the reason why the limiting lines assume 

 their observed locations. 



3. Observations at recorded times, extending from the surface to 

 the bottom, should be made in well determined geographical positions 

 throughout the patrolled region for determining: 



(a) The temperature and salinity of the water by readings in 

 series at definite intervals of depth. 



(6) The direction and rate of movements of the waters at the 

 different depths. 



These observations in each locality should be repeated as often as 

 such locality is revisited. 



4. Each hour there will be recorded the reading of the barometer, 

 the temperature of the air, both wet and dry bulb thermometers, 

 temperature of sea water at surface, the direction and force of the 

 wind, the forms of clouds, direction from which moving, the amount 

 and the visibility, the state of the weather, and the condition of the 

 sea and directions from which swells are coming. 



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