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3058 · Pellatt · "Lighting the Interior of Ships, Buildings, &c" · Page 2
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2 A.D. 1807.--Nº 3058.  

Pellatt's Improvements in Lighting Ships, Vessels, and Buildings, &c.

of the said Invention, for and during the term of years therein mentioned, to have, hold, exercise, and enjoy the said license, powers, privileges, and advantages therein-before granted or mentioned to be granted unto the said Apsley Pellatt, his ex̃ors, adm̃ors, and assigns, for and during and unto the full end and term of fourteen years from the date of the said Letters Patent now in recital next and immediately ensuing, and fully to be compleat and ended according to the Statute in such case made and provided, subject to the usual provisoes, clauses, conditions, and restrictions expressed and contained in Letters Patent for Inventions, and particularly to a proviso, clause, condition, or restriction, that if the said Apsley Pellatt should not particularly describe and ascertain the nature of his said Invention, and in what manner the same is to be performed, by an instrument in writing under his hand and seal, and cause the same to be inrolled in the High Court of Chancery within one calendar month next and immediately after the date of the said Letters Patent now in recital, that then the said Letters Patent, and all liberties and advantages whatsoever thereby granted, should utterly cease, determine, and become void, anything therein-before contained to the contrary thereof in anywise notwithstanding.
    NOW KNOW YE, that the said Apsley Pellatt, party thereto, in pursuance of the said proviso, clause, condition, and restriction above recited and mentioned to be contained in the above recited Letters Patent, doth, by this instrument in writing under his hand and seal, make, declare, specify, and set forth the description of the nature of his said Invention, and of what materials and in what manner the same is to be formed, constructed, and applied, in manner and form following, that is to say:--
    This method consists in placing an illuminator in suitable apertures in the decks or sides of ships and vessels, and in buildings and other places, to answer as a window or skylight. This illuminator is a piece of solid glass of a circular or elliptical form at the base, but the circular form is the most productive of light, and the strongest against accident; it is convex on the side to be presented outwards to receive and condense the rays of light, and has a flat or plane surface on the inside of the room or apartment, which it is intended to light. It is or approaches to a segment of a sphere or spheroid; it is in fact a lens; both sides may in general be left polished, but where the illuminator is to be placed in a situation where any danger may be apprehended of it being acted upon as a burning glass, one side at least should be ground or roughed. Its size is various according to the purpose or situation for which it is designed, and its convexity is increased or diminished according to the side required. The ordinary dimensions are a base of about five inches diameter, to one inch and a half in height from the center of the base; the illuminator is fixed in a