aring. The pulley, E, which, togetherwith twc others, keeps the disk in place, is movable so thatthe disk can be taken out and replaced by another, like theslides of a magic lantern, while the other parts of the ap-paratus may remain in undistarbed connection with the lan-tern. Modena, January,… … BY PKOFESSOK A. RICCO, OF MODENA, ITALY. In studying the effects of electricity, it is interesting tonote the curves or trajectories passed over by particles of elec-trified powders. In order to observe them conveniently, theymay be illuminated by a ray of sunlight. On putting a lit-tle lycopodium…
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