100 ton gun
I donít think this is an Armstrong 100 ton gun for a few reasons
There were only four made for Great Britain, two sent to Gib and two to Malta. There is not record of these ever being shipped back. It was with great difficulty that they were shipped in the first place and even more difficulty encountered in moving them from where they were landed to their emplacements. The expense to return one would have been tremendous. When one of the Armstrongs was damaged on Gib, it was removed and buried on site and its brother, Rockbuster, moved to its location to take the place of the damaged gun.
It would seem odd to me as well to send an Armstrong gun to the Royal Arsenal for repair work, but this may have been commonplace after a gun was purchased from another maker.
The most telling thing to me was the caption that this gun was used to bombard Alexandria. The bombardment was done from a number of naval vessels and no British ships were outfitted with Armstrong 100 ton guns. The largest guns in the bombardment were the 16 inch 80 ton guns of H.M.S. Inflexible. Others had the 11 inch 25 ton gun or the 10 inch 18 ton guns.
I am thinking the device attached to the breech must be the electric firing mechanism. That was to me was one of the most interesting parts this story. Is it possible this is a 16 inch gun which also appears to have a recessed area in the breech.
In one respect at least the Martians are a happy people; they have no lawyers. Edgar Rice Burroughs