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  2. List of Schoolhouse Rock! episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Schoolhouse_Rock...

    1. 1. "Three is a Magic Number". Bob Dorough. Bob Dorough. January 6, 1973. (1973-01-06) A magician shows how magic the multiplication of 3 really is, including a family of three and a football team whose uniforms are numbered in threes. "Three Is a Magic Number" was the pilot episode and had originally aired in full as part of Curiosity Shop ...

  3. Underground rocket - Wikipedia

    en.wikipedia.org/wiki/Underground_rocket

    Underground rocket. An underground rocket or rocket drill is a device for rapidly drilling holes through soil and rock of varying composition at rates up to 1 metre per second [1] [2] by utilising supersonic jets of hot gases. It was developed by Russian engineer Mikhail Tsiferov in 1948.

  4. List of components of oil drilling rigs - Wikipedia

    en.wikipedia.org/wiki/List_of_components_of_oil...

    Drill bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled. It contains jets through which the drilling fluid exits. Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. It is considered the main area ...

  5. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Jobber-length drills are the most commonly found type of drill. The length of the flutes is between 9 and 14 times the diameter of the drill, depending on the drill size. So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times

  6. Roller cone bit - Wikipedia

    en.wikipedia.org/wiki/Roller_cone_bit

    Roller cone bit. A roller-cone bit is a drill bit used for drilling through rock that features 2 or 3 abrasive, spinning cones that break up rock and sediment as they grind against it. Roller-cone bits are typically used when drilling for oil and gas. [1] A water jet flowing through the bit washes out the rock in a slurry.

  7. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

  8. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

  9. Core recovery parameters - Wikipedia

    en.wikipedia.org/wiki/Core_recovery_parameters

    The most widely used definition was developed in 1964 by D. U. Deere. It is the borehole core recovery percentage incorporating only pieces of solid core that are longer than 100 mm in length measured along the centerline of the core. In this respect pieces of core that are not hard and sound should not be counted though they are 100 mm in length.

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