Untitled record

Application filed June 29,1889. Serial No, 316,083. (No model.)

To all whom it may concern:

Be it known that I, George II. Ogilvy, residing at New York_Kin the county of New York and State of New York, have invented 5 certain new and useful Improvements in Projectiles, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to projectiles for io rifled and smooth-bore guns.·

The object of the invention is to produce a projectile which will remain “ point on ” when fired from a rifled or smooth-bore gun and which shall have little atmospheric resist15 ance during its flight.

Figured is a side elevation of the projectile without the self-rifling groove or grooves. Fig. 2 is a similar elevation of a grooved projectile. Fig. 3 is a central longitudinal sec20 tion of a shell made after my invention.

The projectile A is at least three calibers in length. The front 0/ the projectile for a distance of one caliber consists of a cylindrical body portion a, with the front corners b 25 rounded—that is, the front portion of the projectile would be a cylinder of a length equal to its diameter but for the rounding of the point, as illustrated. To the rear of the cylinder the projectile tapers in a true conec 30 for at least two- calibers, terminating in a point d at the rear. Of course slight departures may be made from these proportions; but the rule is Js above stated.

The cylindrical portion of the projectile 35 may be banded· or otherwise prepared in any usual manner to take the rifling of a rifled gun.. The conical rear portion should have deep spiral grooves e. These grooves begin in the cylindrical part « and lead nearly to 40 the rear point of the projectile. These grooves have a pitch in the direction of the rifling, and in rifled guns tend to assist in maintaining the rotary motion. Fired from a smoothbore the grooves will give a rotary motion to 45' the projectile in manner well known.

When the projectile is used as a shell, the conical rear portion of the projectile will be chambered, as at f, the front or cylindrical part of the projectile remaining nearly solid. This tends to throw the center of gravity well 50 forward. The chamber will follow the general outline of the conical rear part, so that the wall of the cone will be of about an even thickness. The fuse h may be inserted from ; the front, and may be any usual fuse. 55

With a projectile of this form, composed ‘of any heavy metal, the center of gravity is maintained well forward. The lines for flow .of the air-are good, and great strength isliad at the front or striking-point. 60

Projectiles have been made with, a taper to the rear, but not, so far as I am aware, in the form here presented. The conical rear portion has been shorter, and was a frustum and not a true cone. 65