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  2. Mount Washington Cog Railway - Wikipedia

    en.wikipedia.org/wiki/Mount_Washington_Cog_Railway

    The cog, or rack and pinion, system that allows the locomotive to climb Mount Washington. Located in the museum. The rack rail design used is one of Marsh's own inventions, using a ladder-like rack with open bar rungs engaged by the teeth of the cog wheel. This system allows snow and debris to fall through the rack, rather than lodging in it. [41]

  3. Rack railway - Wikipedia

    en.wikipedia.org/wiki/Rack_railway

    The Pilatus Railway is the steepest rack railway in the world, with a maximum gradient of 48% and an average gradient of 35%. Functioning of the rack and pinion on the Strub system. A rack railway (also rack-and-pinion railway, cog railway, or cogwheel railway) is a steep grade railway with a toothed rack rail, usually between the running rails.

  4. Ladder logic - Wikipedia

    en.wikipedia.org/wiki/Ladder_logic

    Ladder notation is best suited to control problems where only binary variables are required and where interlocking and sequencing of binary is the primary control problem. Like all parallel programming languages , the sequential order of operations may be undefined or obscure; logic race conditions are possible which may produce unexpected results.

  5. Fixed ladder - Wikipedia

    en.wikipedia.org/wiki/Fixed_ladder

    A fixed ladder is a vertical ladder mounted permanently to a structure. These ladders are primarily used to access roofs or other structures for industrial purposes. In the United States, these ladders are covered by OSHA and ANSI standards.

  6. Category:Vertical transport devices - Wikipedia

    en.wikipedia.org/wiki/Category:Vertical...

    Transport devices which primary use is to transport in a vertical direction (although as a side effect they may also transport in a horizontal direction). These include: Cable cars, inlined planes, funiculars and rack railways; Chair lifts, detachable chairlifts, funitels, gondola lifts and ski tows; Elevators (classical lifts) Hot Air Balloons

  7. Relay logic - Wikipedia

    en.wikipedia.org/wiki/Relay_logic

    Example Ladder Logic Diagram. The schematic diagrams for relay logic circuits are often called line diagrams, because the inputs and outputs are essentially drawn in a series of lines. A relay logic circuit is an electrical network consisting of lines, or rungs, in which each line or rung must have continuity to enable the output device. A ...

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