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ck, which is mentioned in a treatise on artillery by Luigi Collado, printed at Venice in 1586. He says that it had been lately invented in Germany. This lock consisted of a solid steel wheel, with an axle, to which was fastened a chain. The axle was turned by a small lever, and thus winding around it the chain, drew up a very strong spring. By pulling the trigger the spring was let go, and the wheel whirled around with great velocity. The cock was so constructed as to bring a piece of sulphuret of iron down upon the edge of the wheel, which was notched, and touched the priming in the pan. The friction produced the sparks. It was from this use that the sulphuret of iron derived the name of pyrites, or fire-stone. Afterwards a flint or any common hard pebble was used. The complicated nature of this lock, and its uncertainty, prevented its general adoption. The next improvement was due to the Dutch. About the year 1600 there was in Holland a band of marauders known as _snaphausen_, or _poultry-stealers_. However free they were in using the property of others, they were yet unable to incur the expense of the wheel-lock, and the match-lock, by its burning light, exposed them on their nightly expeditions. The wit which had been sharpened by laying "plots" and "inductions dangerous" against unoffending hens and chickens, was turned to the invention of a gun-lock better adapted to their purposes. The result of their cogitations was the lock which, after its inventors, was called the snaphause. It consisted of a flat piece of steel, furrowed like the edge of the wheel in the wheel-lock, which was screwed on the barrel beyond the priming-pan in such a manner as to be movable. By bringing it over the pan, and pulling the trigger, the flint in the cock struck against the steel, and the spark was produced. The simplicity and cheapness of this lock soon rendered it common, and the transition from it to the ordinary flint-lock followed almost as a matter of course. The last improvement which we shall notice was the percussion-lock. This is due to the Rev. Mr. Forsyth, of Belhelvie, in Scotland, though the original form of the lock has been entirely changed by the introduction of the copper cap. [Illustration: INTERIOR OF JENNINGS'S BREECH.] Whilst these improvements were being made in locks, the other parts of the gun were gradually approaching in lightness, strength, and accuracy of finish, to the modern standard. The most valuable
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