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  2. Springfield model 1873 - Wikipedia

    en.wikipedia.org/wiki/Springfield_model_1873

    The Model 1873 was the fifth variation of the Allin trapdoor design, and was named for its hinged breechblock, which opened like a trapdoor. The infantry rifle model featured a 32 5 ⁄ 8-inch (829 mm) barrel, while the cavalry carbine used a 22-inch (560 mm) barrel.

  3. Trapdoor mechanism - Wikipedia

    en.wikipedia.org/wiki/Trapdoor_mechanism

    Springfield Model 1888, trapdoor mechanism open. In firearms, a trapdoor is a form of breech-loading mechanism for rifles in which a hinged breechblock rotates up and forward, resembling the movement of a trapdoor. [1] The Springfield models 1865 and 1873 were best known for first employing this type of action. [2]

  4. Springfield Model 1868 - Wikipedia

    en.wikipedia.org/wiki/Springfield_Model_1868

    The Model 1868 also differed from previous models in that it used a separate Allin type receiver with the barrel attached to it. The Model 1868 was also the first trapdoor conversion to use the cartridge extractor covered by U.S. Patent No. 68,009, issued August 27, 1867 to W.H. & G.W. Miller. The Model 1868 had an overall length of 51 7 ⁄ 8 ...

  5. Springfield model 1870 - Wikipedia

    en.wikipedia.org/wiki/Springfield_model_1870

    The original trapdoor Springfields had replaced only the firing mechanism, and had used a barrel liner to reduce the caliber from .58 to .50. This barrel liner proved to be unreliable in the field, and later trapdoor Springfields, like the Model 1870, abandoned the barrel liner method and used newly manufactured barrels instead.

  6. Trap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(plumbing)

    In domestic applications, traps are typically U, S, Q, or J-shaped pipe located below or within a plumbing fixture.An S-shaped trap is also known as an S-bend.It was invented by Alexander Cumming in 1775 but became known as the U-bend following the introduction of the U-shaped trap by Thomas Crapper in 1880.

  7. Redstone Arsenal - Wikipedia

    en.wikipedia.org/wiki/Redstone_Arsenal

    The U.S. Army Missile Command (MICOM) was activated on August 1, 1962 at Redstone Arsenal, absorbing all of the personnel, facilities, and projects remaining in the prior AOMC. On March 12, 1964, the Francis J. McMorrow Missile Laboratories were dedicated in memory of MICOM's first commander, who died while in command.

  8. Behind the Trap Door - Wikipedia

    en.wikipedia.org/wiki/Behind_the_Trap_Door

    Behind the Trap Door features collaborations with Bono, Bob Neuwirth, and Richard Thompson.In the liner notes, Burnett states: "I was just starting to come out of a dark personal time, and was working these things out of my system.

  9. Trapdoor function - Wikipedia

    en.wikipedia.org/wiki/Trapdoor_function

    For any k ∈ K, without trapdoor t k, for any PPT algorithm, the probability to correctly invert f k (i.e., given f k (x), find a pre-image x' such that f k (x' ) = f k (x)) is negligible. [3] [4] [5] If each function in the collection above is a one-way permutation, then the collection is also called a trapdoor permutation. [6]