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  2. Ell (architecture) - Wikipedia

    en.wikipedia.org/wiki/Ell_(architecture)

    Benjamin Stephenson House's courtyard formed by an ell. In architecture, an ell is a wing of a building perpendicular (at a right angle) to the length of the main portion (main range). [1] It takes its name from the shape of the letter L. Ells are often additions to a building.

  3. Swing equation - Wikipedia

    en.wikipedia.org/wiki/Swing_equation

    The equation describing the relative motion is known as the swing equation, which is a non-linear second order differential equation that describes the swing of the rotor of synchronous machine. The power exchange between the mechanical rotor and the electrical grid due to the rotor swing (acceleration and deceleration) is called Inertial response.

  4. List of roof shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_roof_shapes

    A kink separates the roof into two parts running towards each other at an obtuse angle. Karahafu: A type of gable found in some traditional Japanese buildings. Hidden roof: A type of Japanese roof construction.

  5. Gyroscope - Wikipedia

    en.wikipedia.org/wiki/Gyroscope

    For example, the spinning rotor may be suspended in a fluid, instead of being mounted in gimbals. A control moment gyroscope (CMG) is an example of a fixed-output-gimbal device that is used on spacecraft to hold or maintain a desired attitude angle or pointing direction using the gyroscopic resistance force.

  6. Reuleaux triangle - Wikipedia

    en.wikipedia.org/wiki/Reuleaux_triangle

    Because of this property of rotating within a square, the Reuleaux triangle is also sometimes known as the Reuleaux rotor. [ 5 ] The Reuleaux triangle is the first of a sequence of Reuleaux polygons whose boundaries are curves of constant width formed from regular polygons with an odd number of sides.

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Six degrees of freedom - Wikipedia

    en.wikipedia.org/wiki/Six_degrees_of_freedom

    Mnemonics to remember angle names. The six degrees of freedom of a mobile unit are divided in two motional classes as described below. Translational envelopes: Moving forward and backward on the X-axis. (Surge) Moving left and right on the Y-axis. (Sway) Moving up and down on the Z-axis. (Heave) Rotational envelopes: Tilting side to side on the ...

  9. Rotor (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Rotor_(mathematics)

    A rotor is an object in the geometric algebra (also called Clifford algebra) of a vector space that represents a rotation about the origin. [1] The term originated with William Kingdon Clifford, [2] in showing that the quaternion algebra is just a special case of Hermann Grassmann's "theory of extension" (Ausdehnungslehre). [3]