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2 A.D. 1818.--Nº 4222.  
Preston's Improvements in Deck Glass Rims and Safety Glass
    NOW KNOW YE, that in compliance with the said proviso, I, the said Grant Preston, do hereby declare that the nature of my said Invention, the manner in which thee same is to be performed, are particularly described and ascertained by the following description thereof, that is to say:--
    The outside part consists of a brass or copper strong screw rim, with a broad flat edge to let into the deck as a fixture; the inside part is another rim which screws into the outside or fixed rim, containing a flush glass, but partly convex on the under side. The safety grate is likewise fixed into a screwed rim of the same size and strength as the one that contains the glass, each being made to screw either right or left, so that when the glass is wanted to be taken out for air, it only rests with the person or persons below to take hold of the handles and screw it; it then may be hung upon a hook to prevent rolling about; the safety grate is then ready to screw in in lieu thereof, being quite flush when screwed up; also a ventilating fly fits into the latter rim from below. The handles also answer the end of their being made secure, by padlocking them when the vessel is laid up.

In witness thereof, I, the said Grant Preston, have hereunto set my hand and seal, this First day of April, in the year of our Lord One thousand eight hundred and eighteen.
GRANT (L.S.) PRESTON.

    AND BE IT REMEMBERED, that on the First day of April, in the year of our Lord 1818, the aforesaid Grant Preston came before our said Lord the King in His Chancery, and acknowledged the Specification aforesaid, and all and every thing therein contained and specified, in form above written. And also the Specification aforesaid was stamped according to the tenor of the Statute made for that purpose.

Inrolled the Second day of April, in the year of our Lord One thousand eight hundred and eighteen.
LONDON:
Printed by GEORGE EDWARD EYRE and WILLIAM SPOTTISWOODE,
Printers to the Queen's most Excellent Majesty. 1857.