. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Fig. 3293 is a half-plan and elevation of a revolving light of four faces. In the diagram there arebut two lamps on each of the four sides of a square, though as many as ten lamps are often so placedin lights of the first class. It is obvious in this arrangement that the light from this apparatus mustbe visible in four directions only, and these 90° apart, or at right angles to each other, while the inter-vening spaces must be dark or eclipsed. By causing this apparatus to rotate slowly on its verticalaxis, the brigh
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Fig. 3293 is a half-plan and elevation of a revolving light of four faces. In the diagram there arebut two lamps on each of the four sides of a square, though as many as ten lamps are often so placedin lights of the first class. It is obvious in this arrangement that the light from this apparatus mustbe visible in four directions only, and these 90° apart, or at right angles to each other, while the inter-vening spaces must be dark or eclipsed. By causing this apparatus to rotate slowly on its verticalaxis, the bright and dark portions of the square will be presented alternately to the eye of a distantobserver; in other words, the light will appear and disappear at intervals of time corresponding to thespeed of rotation. Two objects are gained by this arrangement: 1st. A distinctive appearance, bywhich a light that is eclipsed at regular intervals can never be mistaken for a light steadily visible, or,as they are termed, a fixed light. 2d. The power and brilliancy of the light is gre
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
