light cast instead of being spreadover the whole horizon is concentrated into four, six,or ■ eight separate beams. Three types of flashinglanterns are illustrated herewith. The four-sided lan-tern which we show is not provided with refractingprisms above and below the main lens. It belongs tothe… … Upper Cone of Lantern Bearing:. to send out a flash every four seconds. The revolv-ing lantern has ball bearings on the main standardwhich supports the clock mechanism. The clockworkis operated by a weight hanging in a shaft extendingvertically through the center of the lighthouse. Another…
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-60-16.webp)
