A "playful seal"...

[iacob alex]

    ...full of fun,gamesome and witty you can find at   http://www.mcachicago.org/Book/Calder-txt.html   
    The  well -known "Performing Seal"-1950 ,of the famous Alexander Calder,an American forerunner of the dynamic sculpture,it's more than a genial mobile-shape...it's a living lesson of dynamics in gravity and inertia.
    You can play so easy your model,with wood(sticks),metal(wire).
    "Performing Seal" looks as a circus seal balancing a "special ball" on its nose/fulcrum,at any slightest unbalace/breath of air.
    So,for the moment,make one and have fun.
            All the Bests! / Alex

[iacob alex]

....you can see at    www.mcachicago.org/Book/Calder-txt.html    , can we  to take up as a Milkovic's multi-stage arrangement!?.

    Now,if we test a such kind of many level oscillator,what will be the output/input ratio?

    If you think that Milkovic's pendulum with a lever is questionable,regarding the output/input relationship,this "Russian Puppet"style of the same oscillatory phenomenon,can be a proof?!

                    All the Bests! / Alex

[Michelinho]

Hi iacob alex,

Thanks for the link, I have seen his work long ago. Indeed Calder's work is a balancing act of beauty and ingenuity and I see the same in your work. Good luck in your research.

Take care,

Michel

[iacob alex]

       Hi Michel!

   Calder's "playful seal'',among many other his  mobile sculpture,is intended to mimic the fun game of a seal with a ball,at circus.

   At circus,we can admire the sensibility and dexterity of a fatty animal...

   With Calder,this "creature" becomes inertia...because any gentle wind is an input,and the output is a  marvel spectacle.

   I look at this,as an invitation to reconsider inertia,like a fish in water:a huge basic unknown world for mechanics.

             All the Bests! / Alex