About 1190), in his biography of Thomas Becket, gives a graphic sketch of the London of his day and, writing of the summer amusements of the young men, says that on holidays they were "exercised in Leaping, Shooting, Wrestling, Casting of Stones [in jactu lapidum], and Throwing of Javelins fitted with Loops for the Purpose, which they strive to fling before the Mark; they also use Bucklers, like fighting Men."
At the left bank of the river is the Eastern Cataract, a millrace resembling the Leaping Water.
Some one balances the toboggan on the very crest of the hill, while we get on, and when we are ready, off we dash down the side of the hill in a headlong rush, and, leaping a projection, plunge into a snow-drift and go swimming far across the pond at a tremendous rate!...
They were then arboreal; but they speedily entered upon a rapid, although short-lived, course of evolution, during which leaping terrestrial forms like the kangaroos were developed.
If these spark balls are set at the right distance, then when the potential difference accumulates the antenna will be charged and at some stage suddenly discharged by the discharge leaping across the spark gap. This was Marconi's original method, and the plan is still used under the name of the direct method of excitation or the plain antenna.