Schneider-Canet 100mm light QF gun M. 1898



The Schneider-Canet 100mm L/50 gun was built throughout of steel. The breech mechanism, of the concentric-threaded type, had an extra quick-opening action, by which a rotatory motion could open or close the bore by a single action. It had also a safety device against accidental firing, and an extractor, which allowed the automatic expulsion of the cartridge during the opening of the breech-block.

The mounting was generally similar to that of the 65mm gun, but it embodied a special mechanism for the training of the gun. In it the inertia of the movable parts was too great for it to be possible to insure their working with the required rapidity, by simply acting on the butt-end of the gun.

The base was of cast steel, in one piece, its lower flange being bolted on the deck. Its central part formed the seating of the fixed pivot; this was of steel, and its height could be varied at will, owing to the outside threads cut on it. The pivot bore part of the weight of the slide, and insured besides the perfect centring of the system. On the top part of the base there was a horizontal ring, which was continued on the inside by a vertical cylindrical bearing; this was provided with a gun-metal lining. The whole arrangement was suitably stiffened.

The slide was of the same shape as those of the 65mm mountings; its bottom part ended in a step-bearing lined with gun-metal, which clasped the fixed pivot of the base. The brake, with central counter-rod, was placed under the gun-housing; on the top part of the latter there were two cylindrical envelopes that contained the recuperator set of springs.

The mechanism for training the gun consisted of:

a.      a horizontal shaft slightly inclined with regard to the axis of the slide; it was provided with an endless screw worked throught a set of conical pinions, one pinion being keyed on the handwheel shaft;

b.      a circular rack which run round the baseplate; an elastic coupling was used to control the speed of the various parts in the training operations.

The endless screw and the circular rack were surrounded by an airtight envelope, easily removable, to preserve them.

The elevating mechanism, apart from the dimensions, was the same as that of the 65mm gun. All the removable parts were fitted with an airtight cover provided with a lubrificator. The gun-housing was fitted with a butt-end, against which rested the gunner during the service.


SOURCE : DREDGE. James: The Works of Messrs. Schneider and Co. London : Bedford Press 1900, part II, pp. 226-227.