streets in West Philadelphia bear splendid specimens of science, and his achievements ranked among the most splen- | operated by six Bunsen elements. When a series of lamps its work. did of his day, while his skill entitled him to high rank | is used the current should be supplied by a… … The weight of the pendulum may be varied to suit the alternating the belt need not be endless; it may be wound work in hand, a supplemental weight being fitted to each several times upon the pulleys and have its ends attached to side of the pendulum, to be attached or removed as occasion | or by a…
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