100 



UNITED STATES COAST GUARD 



Shown is a bushing for use where an 

 electrical cable passes through a non- 

 watertight bulkhead of less than V^ inch 

 and a stuffing box for a watertight bulk- 

 head. What is the purpose of the bush- 



ing for the non- watertight bulkhead? 

 Shown is a conduit where cable passes 

 through an insulated bulkhead to a cold 

 storage space. What is the purpose of 

 the phenolic coupling? 





NON-WATERTIGHT 

 BULKHEAD 



WATERTIGHT 

 BULKHEAD 



PHENOLIC 

 COUPLING 



With regard to fire protection, why 

 is special care necessary in the construc- 

 tion and maintenance of stairways and 

 elevator enclosures? 



What points should be carefully 

 checked in examining lifeboat limit 

 switches (see illustration) ? 



Can current flow to actuate the winch 

 motor when the limit switch is in good 

 condition and in the open contact posi- 

 tion? 



When damage to a ship's structure or 

 fittings is occasioned by neglect, care- 

 lessness, or poor workmanship of a 

 stevedore or his employees, what action 

 on the part of the master is necessary 

 to assure that the stevedore is held re- 

 sponsible for the cost of repairs? 



What are the advantages and disad- 

 vantages of cork as an insulating ma- 

 terial? Under what conditions is its use 

 forbidden on passenger vessels? 



