Patent GB-190812953-A (GB)
Title: Improvements in and relating to Sighting Apparatus for Quick-firing Field Guns.
Inventor: GARGALIDIS PANAGIOTIS
Filed: 1908-06-17
Granted: 1909-09-17
Abstract: 12,953. Gargalidis, P., and. Condeas, G. Oct. 21, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Sights; field carriages; ordnance breech mechanism.-The rear-sight 44. Fig. 1, of a quick-firing field gun is adjusted for the force and direction of the wind by an upright cam-bar 45, against which a projection 32 on the sight-slide 31 is pressed by a spring. The cam-bar 45 is pivoted at 46 in a box Q and has a pin 47, which is pressed against one of a series of camplates 56 ... 60, shown in plan in Fig. 2, each of which plates corresponds to a definite wind-strength. The plates are slidably-mounted upon a rotatable axis 62, so that they may be moved by a rack-and-pinion gear 63, 64, 65 to engage the appropriate plate with the pin 47. The correction for the direction of the wind is made by rotating the shaft 62 and the camplates by a worm-gear 68, 69 until a pointer 67, driven by a train of gearing 68, 69, 70, 71, 72, points in the same direction as a wind-vane on the vertical shaft 74. The coincidence of the vane and pointer is determined by observing their reflexions in a mirror arranged on the box Q beneath the pointer. The box Q is adjustable upon a longitudinal axis by a worm- and-sector gear 54, 55, to compensate for the inclination of the gun trunnions. Specification No. 3029, A.D. 1904, is referred to. The Specification in the original form, as open to inspection under Section 91 (3) (a), comprises also (1) an elevating gear for giving an independent line of sight, in which the screw-gear for elevating the gun for range is carried by an elevating- arm pivoted to the wheel axle, which arm together with the gun and sights is elevated by an arc-and-pinion gear for the preliminary sighting-operation. During the elevation of the gun for range, the sights are caused to move through an equal and opposite angle to the gun by a double rack-andpinion mechanism. The elevating-screw is combined with a second screw of the same pitch, provided with a longitudinal groove of varying depth so that, as the screw works through a fixed nut, it causes a pointer, which is pressed against the bottom of the groove, to move over a helical range and elevation scale on the nut. The movement given to the elevating-arm is also indicated in degrees and minutes by pointers operated by a train of gearing from the pinion shaft of the elevating-arc. An indicator similar to that last described may be combined with an elevating-screw of ordinary construction. (2) A training gear in which a rack on the trail spade is engaged by a pinion operated by gearing on the trail, so that the carriage is trained relatively to the spade which remains fixed in the ground. (3) A worm-gear for training the gun and recoil-slide upon a vertical pivot rotatably mounted upon the wheel axle. (4) A recoil apparatus consisting of three parallel fixed tubes, connected at their rear ends, and the outer two of which contain liquid, combined with three sliding tubes, which recoil with the gun, and the outer ones of which contain spring-pressed pistons. During the recoil, the pistons act upon the liquid in the outer fixed tubes and force it into the central fixed tube against a spring and hydraulically controlled piston. (5) A vertically-sliding wedge-breech mechanism, in which the operating-crank has ah arm which as the breech is opened actuates the extractor. The firing-pin is struck by an externally-pivoted hammer. This subject-matter does not appear in the Complete Specification as accepted.