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  2. Stephenson valve gear - Wikipedia

    en.wikipedia.org/wiki/Stephenson_valve_gear

    During the 1830s, the most popular valve drive for steam locomotives was known as gab motion in the United Kingdom and V-hook motion in the United States. [3] The gab motion incorporated two sets of eccentrics and rods for each cylinder; one eccentric was set to give forward and the other backwards motion to the engine and one or the other could accordingly engage with a pin driving the ...

  3. Transmission (mechanical device) - Wikipedia

    en.wikipedia.org/wiki/Transmission_(mechanical...

    Transmission internals for a 2009 Volkswagen Golf. A transmission (also called a gearbox) is a mechanical device which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication/reduction in a machine.

  4. Involute gear - Wikipedia

    en.wikipedia.org/wiki/Involute_gear

    The involute gear profile, sometimes credited to Leonhard Euler, [1] was a fundamental advance in machine design, since unlike with other gear systems, the tooth profile of an involute gear depends only on the number of teeth on the gear, pressure angle, and pitch. That is, a gear's profile does not depend on the gear it mates with.

  5. Worm drive - Wikipedia

    en.wikipedia.org/wiki/Worm_drive

    A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm wheel (which is similar in appearance to a spur gear). Its main purpose is to translate the motion of two perpendicular axes or to translate circular motion to linear motion (example: band type hose clamp ).The two elements are also ...

  6. Baker valve gear - Wikipedia

    en.wikipedia.org/wiki/Baker_valve_gear

    The Baker valve gear replaces the expansion link of the Walschaerts gear with an assembly of levers and links which produces the same effect of allowing continuous variation valve travel. The remainder of the gear is the same, so that the return crank and combination lever take the same form, although the proportions are usually modified.

  7. Stages of development - Wikipedia

    en.wikipedia.org/wiki/Stages_of_development

    Kerala model, of development, based on the development experience of the southern Indian state of Kerala, refers to the state's achievement of significant improvements in material conditions of living, reflected in indicators of social development that are comparable to that of many developed countries, even though the state's per capita income ...

  8. AOL Mail

    mail.aol.com/?rp=webmail-std/en-us/basic

    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!

  9. The Myth of the Machine - Wikipedia

    en.wikipedia.org/wiki/The_Myth_of_the_Machine

    The Myth of the Machine is a two-volume book by Lewis Mumford that takes an in-depth look at the forces that have shaped modern technology since prehistoric times. The first volume, Technics and Human Development, was published in 1967, followed by the second volume, The Pentagon of Power, in 1970.