Stars & Stripes Forever by Harry Harrison Read Free Book Online

him so. Told him also that I did not have access to the Britons' secret plans. He was not disturbed at this, just nodded agreement—and turned over to me a complete set of blueprints for the Armstrong."
    "And you constructed this gun?"
    "I did. The Armstrong is a unique hundred-pounder in that it is breech-loading, which makes the guns eminently practical for sea warfare."
    "And why is that?"
    "If you will compare the differences between a gun on land and a gun at sea you will understand. On land, after a gun is fired, the gunners step forward and swab out the barrel and reload. But in a ship, the gun is fired through a gun port, an opening in the hull. So after each shot the gun must be run back, tons of metal you realize, swabbed out and reloaded. Then with great effort on the tackles it is run forward again into firing position."
    "I am beginning to understand."
    "Exactly. If the gun is a breechloader it will not be necessary for it to be run back inside the ship and out again with every shot. This is fine in theory, but the breech on this particular cannon sealed badly, leaking gas, and was unreliable as well. If you will look at these drawings you will see why.
    "It is most cumbersome to load. Firstly, this breech screw must be slackened off to relieve the pressure on the vent piece. This is a strong metal plate that seals the open breech of the gun barrel. It is very heavy and it requires the strength of two burly men to grasp the handles and swing it up onto the saddle. After the bore is sponged out and the vent in the vent piece cleared, and reloaded with a new firing tube, a projectile is loaded through the hollow breech. A lubricator is fitted behind it that contains the black powder charge. Next the vent piece is lowered into place and the breech screw tightened. The gun is now ready to fire."
    "Complex, I agree, but surely a great advantage over the practice of running the gun back and then into position again."
    "I agree, sir, but difficulties soon arise. After a few shots the gun heats up and the parts expand. Burnt powder accumulates and the vent piece jams and leaks quantities of burning gas. After very few shots the gun becomes inoperable. After testing this weapon before delivering it to the Russians I am forced to believe that this is not the path to a successful breech-loading weapon. However there was another improvement on this gun that drew my attention. It had a banded breech to reinforce the loading mechanism. The drawings contained detailed instruction on how this banding was done."
    Parrott started to rise, thought better of it and sat again. His hands twisted together on the desk before him as he struggled to get out the words.
    "It was... a few weeks later that I personally took out the patents on the first Parrott gun."
    Lincoln leaned forward and rested his hand lightly on the troubled man's arm.
    "You have nothing to berate yourself for. You did the right and correct thing. There are many ways to serve one's government. Particularly in the time of war."
    "Then—you knew?"
    "Let us say that Captain Schultz is known to the proper people. So I think we had better let the matter rest there if you please."
    "But..."
    "You serve your country well, Mr Parrott. If you profit from that service it is all the better. And you may be interested to know that the British have withdrawn the Armstrong guns from service for the same reason you just mentioned."
    "I am sure that they did. However I have been improving on the design of a locking breech with what I call an interrupted thread. My first experiments have been most successful."
    "You have dispensed with the vent piece?"
    "I have. Consider, if you would, how secure a breech would be if a breech-block could be screwed into place. The screw threads, in breech and block, would fit tightly against one another along a great length and contain both pressure and gas."
    "It sounds eminently practical. But would not great effort be needed to screw this large