6 l:^;TERNATIONAL ICE OBSERVATION AND ICE PATROL SERVICE. 



11. Each vessel will plot on tracing paper used in connection with 

 the appropriate plotting sheet, the positions and extent of the ice as 

 located from time to time. Such data wiU also be plotted on a 

 duplicate tracing paper, and this duplicate will be delivered to the 

 relieving vessel. 



12. If, in an emergency, it becomes necessary for the junior com- 

 manding officer to conmiunicate directly with Headquarters, in order 

 to avoid delay, a copy of aU such communications will be furnished 

 to the patrol commander. 



13. Barometers of patrol vessels shall be calibrated b}'^ the United 

 States Weather Bureau before sailing on patrol duty. 



W. E. Reynolds, Commandant. 



