The aerodynamically-designed compound pendulum offers highest rigidity in the direction of the impact and practically eliminates any windage losses. Pendulum capacity is easily altered by ...

HAVING read with much interest Mr. Hubert Airy's communication to NATURE (NO. 94), on “Pendulum Autographs,” I wish to say a word on the compound pendulum long ago devised, I believe for the ...

but the beauty and perfection of the results obtained by the compound pendulum of Tisley, and later by the twin elliptic pendulum of Goold, have made the subject sufficiently attractive to be ...