67 HYDROGRAPHIC MANUAL PaGE 626 



(5) DON'T throw down packages of explosives, or slide them along deck or over each other, or 

 handle them roughly in any manner. 



(6) DON'T SMOKE while using or handling any explosive — smoking must be prohibited in the 

 vicinity. 



(7) DON'T permit matches in the vicinity while handling explosives. 



(8) DON'T handle explosives near open lights, open fire or flame, or sparks. 



(9) DON'T handle TNT with bare hands — rubber gloves or other methods of protection must 

 be used. 



(10) DON'T fill bomb containers in an inadequately ventilated place. 



(11) DON'T leave packages of explosives unprotected. 



(12) DON'T expose explosives or detonators to the direct rays of the sun. 



(13) DON'T attempt to extract detonators from a box by inserting a wire, nail, or other sharp 

 instrument. 



(14) DON'T attempt to remove or investigate the contents of a detonator. 



(15) DON'T carry detonators in the pockets of clothing. 



(16) DON'T try to withdraw the wires from an electric detonator, 



(17) DON'T tap or otherwise investigate detonators. 



(18) DON'T investigate misfires in electric detonators — cut an unexploded bomb adrift without 

 bringing it on board. 



(19) DON'T stow fuse in a hot place. Heat may injure the fuse and cause the waterproofing 

 material to damage the powder train. 



(20) DON'T handle fuse carelessly in cold weather. When cold it is stiff and breaks easily. It 

 should be warmed slightly before use. 



(21) DON'T use short fuses. Cut fuse sufficiently long to allow time for the end to seal before the 

 bomb is thrown overboard and to permit the bomb to sink to the desired depth of detonation. The 

 rate of burning should be determined for each coil of fuse. 



(22) DON'T cut fuse on a slant — cut it square across. At the beginning of bombing operations 

 cut off' an inch or two of fuse to ensure having a fresh end inserted in the detonator. See that the fuse 

 is seated against the charge in the detonator before crimping. 



(23) DON'T crimp detonators around the fuse with a knife blade or with the teeth — use only a 

 suitable crimping tool. 



(24) DON'T attempt to light fuse with burning paper or other inflammable material — use only 

 an electric heating unit or other safe device (see 6841 and 6844). 



(25) DON'T use empty explosive boxes for kindling. 



67. SHIP PERSONNEL AND EQUIPMENT 

 671. Personnel Organization 



The organization and duties of the personnel of a hydrographic survey party using 

 R.A.R. are entirely different from those required for other methods of control (see 142, 

 table 2, and 341). In R.A.R. the data are available for use in plotting only after an 

 appreciable length of time after the time of the position, and the operations and per- 

 sonnel are organized to reduce this interval to a minimum. Coordination and coopera- 

 tion are essential and it is important that all personnel perform their duties with perfect 

 timing. 



For operations during daylight hours only, the personnel of a vessel are usually 

 organized into two watches, each of which consists of an officer in direct charge of 

 operations, a chronograph attendant, a recorder, a radio technician, and a bomber, in 

 addition to the fathometer attendant, quartermaster, helmsman, and other members 

 of the watch. For continuous operations on a 24-hour basis, personnel for three watches 

 are required; the watch periods may be rotated daily, or as desired, so that the same 

 personnel do not stand the same watches for extended periods of time. When sufficient 

 experienced personnel are available, the oflficer-in-charge and the chronograph attend- 

 ant, who is usually an officer, may exchange duties. At night, during fog, and during 



