Wave Trains

Some articles on trains, waves, wave:

Generation of 'secondary' Microseisms
... The interaction of two trains of surface waves of different frequencies and directions generates wave groups ... For wave propagating almost in the same direction, this gives the usual sets of waves that travel at the group speed, which is slower than phase speed of water waves (see animation) ... For typical ocean waves with a period around 10 seconds, this group speed is close to 10 m/s ...

Famous quotes containing the words trains and/or wave:

    To write weekly, to write daily, to write shortly, to write for busy people catching trains in the morning or for tired people coming home in the evening, is a heartbreaking task for men who know good writing from bad. They do it, but instinctively draw out of harm’s way anything precious that might be damaged by contact with the public, or anything sharp that might irritate its skin.
    Virginia Woolf (1882–1941)

    Great Powers of falling wave and wind and windy fire,
    With your harmonious choir
    Encircle her I love and sing her into peace,
    That my old care may cease....
    William Butler Yeats (1865–1939)