18. No change in instruments, wires, or connections (other than the batteries, if necessary), to be made on any account, unless such instruments become defective, and any necessary change to be made as quickly as possible.
19. Should the rolling of the ship generate a magnetic current of sufficient strength to embarrass the signals, a stronger current for the signals must be put on by shore on receiving notice from the ship; the notice will be given by 1 current of 5 minutes’, and 5 reversals of 1 minute’s duration.
20. The iron earth of the Cable to be used both on board and on shore: copper earths, however, will be in readiness for use if necessary.
21. Full particulars of every occurrence in the testing-room will be entered in journals, together with the names of the electricians on duty, and the time of their coming on and going off duty.
22. When the end is landed at Newfoundland, should signals fail at any time, the paying-out system to be resumed until signals pass again freely.
23. On receiving a signal of 5 reversals of 1 minute’s, and a current of 5 minutes’ duration, shore must reduce the battery power used for sending reversals by one-half, and on a repetition of the same signal again reduce the power one-half, until (should notice continue to be given to that effect) the minimum of power be reached.
24. Shore must not have the privilege of opening a conversation, or to use or call for the use of the special speaking instruments, under any circumstances, except to give notice of any accident that may cause an interruption of signals, or that may affect the safety of the Cable or signals.
25. Should any interruption of signals from the ship occur by reason of an accident on board, shore will continue to free the Cable at the usual time, and to put to earth direct at the usual time, and in the intervals to put into circuit with the Cable a galvanometer, and watch the same for signals, and continue doing so until communication with the ship is restored, or information is received by other means from the ship.
26. On re-establishment of communication, shore must not ask any questions, but take the resumption of signals as an indication of all being well again, and will continue to follow the series of tests as if nothing had happened.
27. Shore will take time from the ship; should any irregularity in the reception of signals from the ship occur, such irregularity must be entered in journals, and must not form a ground for shore’s altering his time, but shore must follow blindly every change (should one take place), as if the most correct time had been kept.