Home Index Site Map Up: Patent Index Navigation
Up: Patent Index
513,522 · McDougall · "Dead-Light" · Page 2
Home  > Prism Glass  > Patent Index  > Page 2
First: 513,522 · McDougall · "Dead-Light" · Page 1 Last: 513,522 · McDougall · "Dead-Light" · Drawing Prev: 513,522 · McDougall · "Dead-Light" · Page 1 Next: 513,522 · McDougall · "Dead-Light" · Drawing Navigation
513,522: 2 of 3

of the vessel. This framework or wainscoting is provided with a window "D" therein opposite to the dead-light, and in this opening is placed an ordinary pane of glass "E," held in place by ordinary beads "F." By means of suitable wooden pieces or frames "G," I form a small insulated air chamber "H" between the dead-lights and the said window "E," but this is not absolutely necessary since the air space between the wood-work and the outer plating of the vessel may be utilized for this purpose.
    When my invention is applied to wooden vessels, or when the interior wood-work or wainscoting is not used, a separate wooden insulating air chamber is to be formed around the dead-lights in any suitable way. By making use of this insulating chamber the warm air of the interior of the boat is kept from coming in contact with the dead-light, thereby preventing condensation, and should there be any condensation on the window or pane "E," the large area thereof compared with the combined areas of the dead-lights is so great as not to interfere with the proper deflection of the light.
    By making use of the conical depending portions of each dead-light, the light in passing through the same will be deflected in all directions so as to greatly facilitate the proper lighting of the vessel.
    It is to be understood that my improved dead-lights may be used with or without the said insulating air chamber, and that said insulating air-chamber may be used with or without said improved dead-lights, but I prefer to make use of the particular combination of elements which I have described herein, since thereby I am enabled to increase the efficiency of the device in many important respects.
    Having now described my invention, what I claim as new therein, and desire to secure by Letters Patent, is as follows:
    1. The combination of the plate A, having openings therein; the plate B, having flared openings corresponding to the openings in the plate A, but of smaller diameter at their upper ends than the said openings in the plate A, so as to form shoulders d; and dead lights resting on said shoulders and held in place in the openings in the plate A, by means of cement and entirely above the plate B, substantially as set forth.
    2. The combination of the plate A, having openings therein; the plate B, secured thereto and having openings corresponding to those in the plate A, but of smaller diameter at their upper ends, so as to form shoulders d; dead lights resting on said shoulders and held in position in the openings in the plate A by cement entirely above the same, and an insulating chamber H, beneath said dead lights for the purpose mentioned, substantially as set forth.
    3. An improved dead light for use on vessels, consisting of the lens or bull's eye portion e, of smaller diameter at its upper end and a conical deflecting portion f integral therewith, extending down from its lower face, the whole being made of glass, substantially as set forth.
    4. An improved dead light for use on vessels, consisting of the plano-convex lens portion e, of smaller diameter at its upper end, and a conical deflecting portion extending down from its concave face and integral therewith, the whole being made of glass, substantially as set forth.
    5. In an improved dead light for use on vessels, the combination of the plate A, having openings therein; the plate B, secured thereto by means of rivets, the heads of which extend on the outside of the vessel so as to protect the dead lights, said plate B being provided with flared openings corresponding with openings in the plate A, but of smaller diameter at their upper ends, so as to form shoulders d, and dead lights resting on said shoulders entirely above the plate B, and held in place by cement, substantially as set forth.
    6. In an improved dead light for vessels, the combination of the plate A, having openings therein; the plate B, secured thereto by means of rivets and provided with openings corresponding with openings in the plate A, but of smaller diameter at their upper ends, so as to form shoulders d, dead lights resting on said shoulders and held in place by cement; the wall or wainscoting C, of the vessel, and the glass pane B, in said wainscoting beneath the dead lights, substantially as set forth.
ALEXANDER MCDOUGALL.
In presence of--
    FRANK L. DYER,
    J. B. MCGIRR.