(I)
(J)
In the event of the large torpedo being cut away in deep water after withdrawal of the safety key, it will explode by pressure on the head of the bolt at about sixty fathoms depth. The small one at about thirty.
The brass guard for the exploding bolt is an extra precaution (suggested by Capt. A. Hood, R.N., Director-General of Naval Ordnance) should any person by mistake attempt to place the bolt into the torpedo without the safety key in its place. It is placed over the head of the bolt and pushed down until the thumb-screw on the side works into a small hole in the shoulder of the bolt.[1] The manner in which this guard is fitted ensures its removal before launching, since the after lever cannot be placed until it is. It also makes a convenient handle for turning the bolt in the magazine.
[1] As the certainty of explosion depends mainly upon the exploding bolt being properly charged, the inventor takes entire charge of this important detail.
(K)
