Q. Explain how to set operating panel for automatic firing.
A. All contacts, connections, switches, etc., having been previously tested and examined by the electrician and found in order:
1o Close up the testing, automatic, mine, power, and gong switches.
2o Close firing switch.
Note.—If one or more automatic switches cannot be made to stay up, open the power switch for that mine before closing firing switch.
Q. How would you fire by judgment?
A. Conditions being as above, lift the automatic switch release of the mine to be fired at the command "Fire".
Q. How are mines tested?
A. 1o Put D. C. on D. C. busses.
2o Open power switches on all mine blocks.
3o Unscrew all green lamps except on panel being tested.
4o Close switch No. 3 down.
5o Close power switch of each mine in succession and read milli-ammeter. This should be about 30 to 40 milli-amperes.
Q. Point out and describe the parts of a boat-telephone.
A. See Fig. 107.