. Lighthouse construction and illumination; . Glazing of Lanterns.—Great care is bestowed on the glazingof the lantern, in order that it may be quite imper^iousto water during the heaviest gales. There is a certainamount of risk of the glass plates being broken by theshaking of the lantern during high winds; and to preventthis as much as possible various precautions are arris of each plate is always carefuUy rounded by grind-ing; and grooves, about | iucli wide, capable of holdinga good thickness of putty, are provided in the astragals forreceiving the glass, which is \ inch thick.
. Lighthouse construction and illumination; . Glazing of Lanterns.—Great care is bestowed on the glazingof the lantern, in order that it may be quite imper^iousto water during the heaviest gales. There is a certainamount of risk of the glass plates being broken by theshaking of the lantern during high winds; and to preventthis as much as possible various precautions are arris of each plate is always carefuUy rounded by grind-ing; and grooves, about | iucli wide, capable of holdinga good thickness of putty, are provided in the astragals forreceiving the glass, which is \ inch thick. Small piecesof lead or cork are inserted between the frames and theplates of glass, against wliich they may press, and by which MISCELLANEOUS SUBJECTS. 225 they are completely separated from tlie more unyieldingmaterial of wliicli the lantern frames are composed. Storm Panes.—In the event of a breakage occurring to anyof the panes in the lantern, which is not unfrequently thecase from birds or small stones being driven against it during.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881
