38 



UNITED STATES COAST GUARD 



What is a hygrometer and what is it 

 used for? 



What is a Pitometer Log? Describe 

 its principle. 



When a patent log line is hauled in, 

 how do you take the turns out before 

 drying it and stowing it away? 



What is a stadimeter? 



What is a hydrometer and what is it 

 used for? 



What is a psychrometer? 



Where is information concerning 

 loran coverage, charts, and tables avail- 

 able? 



Which end of a Kelvin sounding tube 

 must be uppermost when taking a 

 sounding? 



Describe the glass sounding tube or 

 other depth recording device used with 

 a patent sounding machine, and state 

 how Boyle's law applies to the principle 

 upon which it operates. 



Give a brief description of the prin- 

 ciple and operation of the Fathometer. 



Explain the use of chemical tubes to 

 record soundings. 



What effect will an unusually soft 

 bottom have on soundings obtained by 

 fathometers? 



Explain in detail and in proper order 

 the procedure to be followed in taking 

 soundings with a sounding machine. 



What method is generally employed 

 aboard merchant ships for checking ac- 

 curacy of a chronometer and determin- 

 ing its rate? 



Why is the morning normally the best 

 time of day for winding time pieces? 



Where will complete information be 

 found on the times, frequencies of emis- 

 sions, and characteristics of radio time 

 signals? 



On 1 June, a time signal at 1200 

 GMT shows chronometer "A" 3m-52s 

 fast. On 5 June, a time signal at 1800 

 GMT shows chronometer "A" 3m-35s 

 fast. An observation is taken on 7 June 

 at 1800 GMT. Assuming a constant 

 chronometer rate, what correction 

 should be applied to chronometer "A"? 



In New York (Zone +5) a time sig- 

 nal was heard, and at 1400 Eastern 

 Standard Time, the chronometer read 

 18h-35m-38s. What was the chronom- 

 eter error? 



What is the reading of the microme- 

 ter sextant illustrated? 



