248 SOCIETY NAVAL ARCHITECTS AND MARINE ENGINEERS. 



4. Instructions. 



1. The Urgent and Important Signals may be made without the Preparative Sig- 

 nal being answered if it is supposed that the person addressed cannot reply, or in other 

 special circumstances ; but in this case a pause should be made between the Preparative 

 Signal and the message. 



2. The Signal (FF) is used previous to any letters which are 



intended to spell words. 



3. The Signal (MMM) is used previous to any message sent by 



means of the International Code of Signals. 



4. The Signal (MM) means the Code Flag of the International Code 



of Signals, and is used as indicated in the Code Book. 



5. The Break Sign is used between the address of the receiver and the text of the 

 message, and after the message if the name of the sender is to be signalled. 



6. The Stop is used, where necessary, in the text of the signal. 



7. The Erase is used to cancel the last word or signal group, sent by mistake. 



8. The Annul is used to cancel all the message. 



9. Method of Answering. — Each word or signal group, when understood, is to be 

 answered by one long flash — (T). 



If a word or signal group is not answered, the sender is to repeat it until answered by 

 a long flash. 



At the end of the message, if understood, the receiver will make (RD). 



The Erase and Annul signs are to be answered by their own signs. 



10. The Nationality Signal is made immediately after the answer to the Prepara- 

 tory Signal has been received, to indicate the nationality of the vessel making the signal. 

 It is answered by the nationality signal of the vessel receiving the message. 



Article IV. 



A printed copy of the code of urgent and important signals shall be placed in a promi- 

 nent position in the chart room of every ship. 



CONSTRUCTION. 



Article V. 



definitions. 



The meaning of the principal technical and other expressions contained both in the 

 Convention and in these Regulations, under the heading of Construction, is as follows: 



(1) The load zuater line is the water line used in determining the subdivision of the 

 vessel. 



(2) The length of the vessel is the extreme length at the load water line. 



(3) The breadth of the vessel is the extreme width from outside of frame to outside of 

 frame at or below the load water line. 



(4) The bulkhead deck is the uppermost continuous deck to which all transverse 

 watertight bulkheads are carried. 



