increase of speed

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References in classic literature ?
Bumble relaxed his pace, and turned his head as if to make sure that his helpmate was following; then, discovering that she was close at his heels, he mended his rate of walking, and proceeded, at a considerable increase of speed, towards their place of destination.
His hat lurched drunkenly as he answered the girl's increase of speed. He cursed it in a brief aside.
PES for a given system increases in proportion to the increase of speed. Simple testing can demonstrate this.