. Appleton's dictionary of machines, mechanics, engine-work, and engineering. employed to carry some of his improvements into effect. In the dioptric lights on (ho Scotch coast, acommon lamp, with a largo wick, is kept constantly ready for lighting; and, ID the event of the suddenextinction of the mechanical lamp by the failure of the valves, it is only necessary to unscrew and re-move its burner, and put the reserve-lamp in its place. The height, of this lamp is so arranged thai itsflame is in the focus of the lenses, when the lamp is placed on the ring which supports the burner of themechani
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. employed to carry some of his improvements into effect. In the dioptric lights on (ho Scotch coast, acommon lamp, with a largo wick, is kept constantly ready for lighting; and, ID the event of the suddenextinction of the mechanical lamp by the failure of the valves, it is only necessary to unscrew and re-move its burner, and put the reserve-lamp in its place. The height, of this lamp is so arranged thai itsflame is in the focus of the lenses, when the lamp is placed on the ring which supports the burner of themechanical lamp; and as its flame, though not very brilliant, has a considerable volume, it answers the 616 SEA-LIGHTS. purpose of maintaining the light in a tolerably efficient state for a short time, until the light-keepershave time to repair the valves of the mechanical lamp. Only three occasions for the use of this reserve-lamp have yet occurred. The most advantageous heights for the flames in dioptric lights are as follows: Inches. 1st Order 10 to 11 centimetres = 3-94 to 4-
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
