Friction Ridge Identification

Famous quotes containing the words friction and/or ridge:

    “We have got onto slippery ice where there is no friction and so in a certain sense the conditions are ideal, but also, just because of that, we are unable to walk. We want to walk so we need friction. Back to the rough ground!”
    —Ludwig Wittgenstein (1889–1951)

    “All sound heard at the greatest possible distance produces one and the same effect, a vibration of the universal lyre, just as the intervening atmosphere makes a distant ridge of earth interesting to our eyes by the azure tint it imparts to it.”
    —Henry David Thoreau (1817–1862)