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Patents: 191 of 511

A.D. 1886, 25th MAY. Nº 6991.
First: 342,030 · Nelke · "Incidence-Window" · Page 1 Last: 6,991 · Nelke · "Improvement in Incidence Windows or Vault Lights" · Drawing Prev: 342,030 · Nelke · "Incidence-Window" · Page 1 Next: 342,030 · Nelke · "Incidence-Window" · Page 1 Navigation
Louis Nelke
2 of 2
COMPLETE SPECIFICATION.


Improvement in Incidence Windows or Vault Lights.

    I, LOUIS NELKE, lithographer, of Baltimore City, in the State of Maryland, United States of America, do hereby declare the nature of my invention for INCIDENCE WINDOWS OR VAULT LIGHTS and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:--

    My invention relates to Incidence Windows or Vault Lights. The art of illuminating vaults, cellars and basements by means of incidence windows has long been practiced, but difficulty has been experienced in setting the glasses the frames in such manner as to afford the most light and at the same time prevent the leakage of water. The lenses or glasses have heretofore been countersunk in the frames, or set like steps of stairs, but when thus done the water shed is imperfect.
    The invention as hereinafter described overcomes the difficulties and objections mentioned, and said invention consists in a lens or glass of prismatic or approximately prismatic form having two shoulders or offsets-- one at one side near the top at the plane of incidence, and the other at the opposite side and below the first at the plane of reflections, whereby the glass may be set on a frame which shall have a slanting position, so that the upper surface or plane of incidence will be horizontal-- this position being the most appropriate to receive and transmit the light.
    My invention also consists in the combination of the said lens and the slanting frame on which it is supported.
    It also consists in the entire structure as shown in Figure 2 having between the lenses ventilating openings which are provided with covers.
    The invention is illustrated in the accompanying drawings in which
    Figure 1 is a perspective view of a lens of glass formed according to my invention.
    Figure 2 is a view of a frame supporting my improved lenses and also showing the ventilating openings, one of which is uncovered.
    Figure 3 is a sectional view of the slanting frame and one lens of the form of that shown in Figure 1.
    Figure 4 is a view of a lens formed according to my invention but differing somewhat from that shown by Figure 1.