qual to that of the wheels, or one of the annexed engraving? If we trust to our eyes, we being 34 in the first, 27 in the second, 30 in the third, shall certainly say it is No. 3. But if we take a pair of the multiples thereof, and their negative poles and so on—each of the folio wing having a… … tance. Like other sirens, it gives at will one or AH OPTICAL ILLUSION. dynamic one, constructed by Mr. Hipp accord- several tones, and the interval between these may ing to an American model.— Condensed from La be fixed in advance. In its simplest form it consists es- Lumiere Electrique.…
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