In accordance with the invention, therefore, the chamber has at its front end a section of reduced cross-sectional area. Weight, size and cost are reduced without seriously affecting the efficiency of noise reduction. The silencer may be built as an attachment or, preferably, the rear portion of the chamber may be built around the barrel of the firearm, with communicating holes through the barrel. The heat absorbing material may be metal screen , which may take the form of apertured discs, stacked one upon another and preferably held in compression. Plating the screen with some metal such as tin before punching the discs will increase the stability of performance. ^
Flash Powders and their Production
Flashpowders are some of the most explosive kinds of powders known. In fact, Lenz* even regards flashpowder as high explosive due to its tremendous power. In addition to th i s, f 1 ashpowders are both easy and safe to manufacture. It is because of this that I have decided to explain in detail the manufacture of these powders.
*Lenz.Robert R,, Explosives and Bomb Disposal Guide.
The most common of these powders is "Photof1 ash" powder or just simply "Flash" powder. This powder is the easiest to manufacture and the least expensive. The equipment needed to make photoflash powder is a mortar and pestle, a scale or balance,and several plastic containers. The chemicals required are;powdered aluminum (Al), sulphur (S) , and potassium permanganate (KMnO**). These chemicals should all be finely powdered for best results. (It is best to buy finely powdered aluminum as It cannot be ground. Sulphur and potassium permanganate should be ground separately in the mortar and pestle to a consistancy of flour.) The ratio of weight of these chemicals is: one (1) part sulphur, one (l) part powdered aluminum, and eight (8) parts potassium permanganate. After powdering, these chemicals should then be placed in a plastic container and shaken thoroughly for ten (10) minutes to Insure even mixing. The ♦flashpowder should then be kept in
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