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342,030 · Nelke · "Incidence-Window" · Page 2
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b' b', fit perfectly water-tight, and may in rough or cold weather be entirely closed, thus presenting a surface perfectly water and weather proof. The slots may be continuous or not, and may be arranged longitudinally, if desired.
    In some cases I may dispense with ventilation, and not have the frame provided with openings.
    Having thus described my invention, what I claim, and desire to secure by Letters Patent, is--
    1. A lens of prismatic or approximately prismatic form having shoulders or offsets, one being on one side near the top at the plane of incidence, and another being situated on the opposite side at the plane or reflection below the other, substantially as described.
    2. The combination of a lens of prismatic or approximately prismatic form having
shoulders or offsets, one on one side near the top at the plane of incidence and the other on the opposite side at the plane of reflection and below the other, with a frame, the lenses being held in suitable position in or upon the frame by the shoulders or offsets, substantially as described.
    3. A vault-light or incidence-window consisting of the frame provided with the described lenses, and having one or more lateral openings between the lenses, to be provided with suitable covers, substantially as set forth.
    In testimony whereof I affix my signature in presence of two witnesses.
LOUIS NELKE.
Witnesses:
    R. G. DYRENFORTH,
    W. W. MORTIMER.