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1 Kommentar zu “Wheel, Lever, Wheelbarrow, Gear-Wheel, Crank, Steam Engine, Electric Motor, Digitalization …”

  1. Chris Wood (Thursday October 5th, 2017)

    For a time, as a boy, I wanted more Mecano,each Xmas. The cog wheels interested me greatly. I remember that the cogs that gave a ratio 2 to 1 had 25 and 50 teeth respectively. But for a ratio 3 to 1 they had 19 and 57 teeth. I do not know exactly why the teeth added to 75 in one case and 76 in the other.
    There were also worm gears to give larger ratios, but only in one direction. Friction prevented them working backwards.
    (I use “respectively” correctly above. It cannot be used to mean “and/or”, as my Siemens Technical Dictionary implied).

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