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Page:Popular Science Monthly Volume 90.djvu/551

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few ideas which have been pro- posed to increase its accuracy

��An Iris Diaphragm for Both Front and Rear Sights

ELIMINATING the objections both to the peep rear sight and to the aperture front sight, Brian C. Bullen, of Paterson, N. J., has done the obvious thing and applied the well-known iris diaphragm principle to both front and rear sights. Just as this form of dia- phragm has supplanted in camera con- struction the old and clumsy form of a rotating .plate with various sizes of holes, it has here taken the place of the rotating disk on the rear sight, elimi- nating the make-shift of changing front aperture rings to correspond with the size of the bull's-eye. The Bullen system consists merel}' of the familiar rotating ring control- ing the leaves of an iris diaphragm actuated by a pointer or movable button. The moving leaves, as in the camera shutter, increase or decrease the open- i

ing in the sight. So equipped the user of the rifle can adjust the rear sight for the prevailing light.

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����NOTCH IN OPtNlNS PMrtlTS RtMOWAI. Of CLIP FROM

��Using this can reload

��clip the the six

��man firing chambers in

��the revolver two seconds

���With the Bullen system the moving leaves increase or decrease the sight opening

��Lubricating the Rifle Barrel with a Graphite Cartridge

A WASHINGTON man has invented a cartridge containing a charge of pow- dered artificial graphite between the powder and the bullet or shell, the graphite con- tained between a wad over the powder, and the base of the projectile. Artificial graph- ite won't burn up at rifle temperatures, and it is a fine lubricant for steel. When the powder burns, the graphite is driven out between shell and chamber, lubricating the barrel both ahead of and behind the projec- tile, protecting the steel just ahead of the cart- ridge from melting by the powder gases — ero- sion — and lubricating the bore for the passage of the missile.

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��The artificial graphite is contained be- tween the powder and the bullet or shell

��Reloading a Revolver in Two Instead of Fifteen Seconds

THE automatic pistol usually carries its cartridges in a detachable magazine. It is quickly reloaded by dint of slipping in a spare filled one, or else, in the case of some of the foreign war-pistols, by stripping a clip of cartridges into the fixed magazine as the soldier strips 3 DIAPHRAGM ON FRONT thcm into his Mau-

ser. This gives a far higher con- tinuous rate of fire for the re- volver.

Now comes a member of one of the famous old American revolver- making firms, with a clip for slipping six shells at a time into the revolver cylinder.

He has two forms of clip, one a flat plate with holes cut around its periphery to fit the grooves in rimless cartridges, and with a circular spring to hold the cartridges in the clip or plate. In the other spring, fingers opposite each opening hold the cartridges in. Plate and six cart- ridges go into the gun, the cartridges into their chambersinthe cylinder, the plate flat against the back of the cvlinder. When fired six times, the gun is emptied by a single movement of the ejector rod as usual.

Fired cartridges can be replaced with fresh ones in two seconds.

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