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UNITED STATES PATENT OFFICE
ISAAC M. BEARSE, OF BOSTON, MASSACHUSETTS.
IMPROVEMENT IN DECK-LIGHTS.
Specification forming part of Letters Patent No. 136,299, dated February 25, 1873.
To all whom it may concern:
Be it known that I, ISAAC M. BEARSE, of Boston, Suffolk county, State of Massachusetts, have invented an Improved Deck-Light; and I do hereby declare the following description and accompanying drawing are sufficient to enable any person skilled in the art or science to which it most nearly appertains to make and use my said invention or improvement without further invention or experiment.
My invention relates to an improved arrangement for securing what is known as the bull's-eye deck-light in the decks of ships and other places where such lights are used, by which several advantages over the ordinary method are secured.
In order to explain my invention so that others will be able to understand its construction and object, reference is had to the accompanying drawing forming a part of this specification, in which--
Figure 1 is a vertical section of my invention. Fig. 2 is a plan view.
Let A represent a section of the deck or other floor in which it is desired to place a glass sky-light of the class above mentioned. The glass deck-light, which is usually employed for this purpose, and which is known as a "bull's-eye" light, consists of a solid piece of glass, the downward-projecting portion of which is rounded in the form of a hemisphere. The bull's-eye is usually screwed into the deck from below, so that its rounded or hemispherical portion will project down into a bell-shaped or flaring concavity on the under side of the deck, the upper flat side coming up level with the surface of the deck or floor. As the deck wears down the this upper flat side of the glass "bull's-eye" is left projecting above the surface of the deck, and the corners or edges become nicked and broken from one cause or another, rendering its appearance unsightly, and frequently causing them to leak. By my arrangement I construct the bull's-eye B with a horizontal flange C which projects
entirely around it a short distance below its upper flat surface, as shown.
The lower side of the deck I then provide with a flaring concavity in the
same manner as is ordinarily done, in order to allow the rays of light to
diverge in all directions from the bull's-eye, after which I countersink
the upper side of the deck at m, so that it will admit the flange
C, leaving a shoulder or seat, e, for the flange or a washer, as
the case may be, to rest upon. This countersink communicates with the
concavity below. In some cases I shall first place a washer, f,
on the seat e, which will prevent the flange c from sinking
into the wood. The glass bull's-eye is then placed in the hole, so that
the flange will rest upon the washer, and above the flange I will place
a metal ring, g, which is provided with ears i, which rest
in corresponding recesses in the deck. The upper face of the ring will
then be flush with the deck, and also with the upper flat face of the
deck-light, so that the whole will present a level and even surface.
Screws can be inserted through the ears i into the deck beneath, and
the proper luting applied around the edges to render it water-proof. By
this arrangement the edge of the bull's-eye is protected by the metal
binding, and when the deck wears down the upper recess can be slightly
deepened, and the surfaces again made to correspond.
Having thus described my invention, what I claim, and desire to secure by Letters Patent, is--
The bull's-eye B with its flange C, in combination with the countersink m, seat e, and upper fastening-ring g, either with or without the washer f, all combined and arranged substantially as and for the purpose above described.
In witness whereof I hereunto set my hand and seal.
J. L. BOONE,
C. M. RICHARDSON.