The wires that should show closed circuit are the two red wires and the black wire and transformer case. Those that should be open are the black, and either red wire. (See Fig. 102.)
Q. How are fuses tested?
A. With a dry cell and a circuit detector. A closed-circuit test is all that is necessary. This should always be done under the supervision of an experienced electrician.
Q. What apparatus is used in preparing a compound plug complete?
A. Bench vise, S-wrench, large monkey wrench, screw driver, small pliers, navy knife, loading wire, cotton-braided wire, priming charge, fuses, rubber packings, brass washers, followers, lead washers, set screws, red lead or ruberine, circuit detector, brass jointers, rubber tape.
Q. What is the method of numbering mines?
A. Facing in the direction of the expected approach of the enemy's ships, mines are numbered from left to right, beginning with No. 1.
Q. How are groups numbered?
A. In the same manner. No. 1 group on the left, No. 2 next toward the right, etc.
Q. How are the mooring-ropes prepared, and what are the rules for length of mine cables and of mooring-ropes?