70 



UNITED STATES COAST GUARD 



22. SIGNALING BY INTERNATIONAL CODE 

 FLAGS, FLASHING LIGHT; LIFESAVING, 

 STORM AND SPECIAL SIGNALS. 



State precisely how you would express 

 the following times using coded inter- 

 national code flag signals : 



(a) 3:18 a.m. 



(b) 7:56 p.m. 



(c) 11:01a.m. 



(d) 11:01p.m. 



How many flag hoists should be 

 shown at a time? 



You are on a ship constructed with 

 twin screws and have lost both pro- 

 pellers. The flag signal "TH" means "I 

 have lost my propeller." In signalling 

 another vessel, how could you assure 

 that he understands you have lost both 

 propellers? 



When a vessel is in distress and has 

 sent a radio telegraph message request- 

 ing assistance, what measure would be 

 taken to insure that rescue craft can 

 obtain her precise position and shortest 

 course to take in order to assist her? 



What radio distress signal is provided 

 so that a vessel may obtain assistance 

 from other vessels even though such 

 vessels may not have a radio operator 

 on watch at the time the distress signal 

 is transmitted? 



What pyrotechnic equipment must be 

 provided on United States merchant 

 vessels on the high seas for the purpose 

 of indicating that they are in distress 

 and require assistance from other ves- 

 sels or the shore? 



If you sighted a red flare at sea, sus- 

 pended by a small parachute about 300 



feet above the water, with no vessels or 

 aircraft in the vicinity of the flare, what 

 does the signal indicate, and what ac- 

 tion would you take? 



If an aircraft flies over your ship 

 and circles, then crosses close ahead at 

 a low altitude opening and closing the 

 throttle, or changing the propeller 

 pitch, and then heading away in a par- 

 ticular direction, what action would 

 you take? 



If, after a period the aircraft crosses 

 the wake close astern at a low altitude, 

 opening and closing the throttle, or 

 changing the propeller pitch, what 

 would this indicate? 



What is the standard rate of sif- 

 nalling by semaphore? 



What does "PRB" mean when it ii 

 received as the first group in the text 

 of a message tent by flashing light? 



State the function of the model verb 

 "Glean." 



If you are receiving a message in 

 morse code, which is being transmitted 

 by sound, what procedure should you 

 follow when a word or group is missed? 



If while at sea, you sighted a buoy 3 

 feet in diameter painted yellow, what 

 action must you take? 



What are the warning signals dis- 

 played in inland waters of the United 

 States by Coast Guard vessels while 

 handling or servicing aids to naviga- 

 tion? 



24. SEAMANSHIP. 



Why is great care necessary in in- 

 specting preformed type wire rope, 

 when this is used for cargo falls, top- 

 ping lifts, slings, guys, or other gear on 

 a ship? 



Describe in detail how you would at- 

 tach a wire rope socket. 



A pontoon weighing 2,000 pounds is 

 to be lifted by a four-legged bridle sling, 

 each leg of the sling forming an angle 

 of 15 degrees with the top of the pon- 

 toon as indicated in the .-sketch below. 

 What is the stress on each leg of the 

 sling when the weight of the pontoon is 

 suspended from it? 



What would be the effect of a wire 

 rope fall jamming in a sheave of the 

 purchase of a jumbo boom when lower- 

 ing a weight? 



Why is extra care necessary when 

 winding wire rope for the purchase and 

 topping lift of a heavy lift boom on 

 winch drums? 



What circumference of manila line 

 would be required for a lifeboat fall 

 rove off through two triple blocks if the 

 weight of the boat is 4,000 pounds, the 

 gear of the boat 1,050 pounds, and the 

 capacity 30 persons? 



Hint : The weight of each person by regula- 

 tions is considered 165 pounds. The factor of 

 safety required by regulations is 6. Use the 

 formula B = C2 x 900 for computing strength 

 of manila line, where "B" is breaking strength 

 in pounds, "C" ii circumference. Friction is con- 

 sidered at 10 percent loss per sheave. 



