Friction firing devices

Friction Compositions for Friction Detonators Friction Firing Devices and Friction Igniters or Primers. These are powders which are easily ignited by friction. Some of the simplest mixtures are K chlorate with sugar or with antimony sulfide. Davis (Ref 1, p 453) gives table listing three compns which have been widely used in friction primers for artillety, separate-loaded ammunition... 

Friction Firing Devices. One Pull-Friction Type Firing Device, M2, is described in Vol 4 pp D770-R D771-L R with Fig 26. It has been used for firing booby traps... 

Compositions used in friction primers are listed under Friction Compositions (Compare with Friction Detonators and Friction Firing Devices)... 

Pull-Friction Type Firing Device M2 (Demolition) (Fig 26) is designed for actuation by a pull wire and intended for use in setting... 

Fires may be started by one or several of die following so-called "common fire hazards matches and cigarets, rubbish (spontaneous ignition), locomotive sparks, mechanical spartks, friction, open-flame devices, heating appliances, electric wiring and equipment, static electricity and lightning. The primary object of fire prevention and extinction is to avoid loss of life and personal... 

Friction Igniters or Primers (Also known as Friction Tubes). They are devices for the production of fire by the friction of the thnist, gjtVi or push, or pu 11, of a roughened rod or wire... 

Primary explosives explode from shock, from friction, and from heat. They are used in primers where it is desired by means of shock or friction to produce fire for the ignition of powder, and they arc used in detonators where it is desired to produce shock for the initiation of the explosion of high explosives. They are also used in toy caps, toy torpedoes, and similar devices for the making of noise. Indeed, certain primary explosives were used for this latter purpose long before the history of modern high explosives had yet commenced. 

W-Viton delay compns have better storage stability than Mn delay compns at RT and at temps of up to 200°F, as detd by surveillance of loaded cartridge activated and ignition devices First Fire Compositions. A reduction of over 60% of formulation impact, friction and Electrostatic sensy has been achieved according to... 

Pressure relief devices must be properly sized (capacity), and discharge location is critical. These devices are generally sized for the most likely pressure increasing event, e.g., external fire or internal process upset such as an uncontrolled exothermic reaction. The engineer must calculate the temperature and pressure increases associated with the event as well as the expected release volume. He or she must also account for pressure drops across the relief device as well as for friction losses in the lines. A decision must also be made about whether to discharge to the atmosphere or to a closed system that includes a scrubber, a flare, or even as simple as a water tank, such as is sometimes used for venting anhydrous ammonia. Some of these design decision issues are addressed in more detail by Crowl and Louvar. ... 

Between about 1780 and 1850 a variety of fire-making devices were invented. The pyrophoric properties of white phosphorus were utilised in the earliest form of matches, which consisted of strips of paper tipped with the element and sealed in glass tubes. When broken, the paper would catch fire. The first striking matches ( friction lights ) were invented by J. Walker of England in 1826, but these did not contain phosphorus. Shortly afterwards a great improvement was achieved by C. Sauria of France who incorporated white P in the formulation. 

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