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38,788 · McCormick · "Improvement in Mode of Ventilating and Illuminating Risers" · Page 1
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Patents: 32 of 511
UNITED STATES PATENT OFFICE
MICHAEL J. MCCORMICK, OF NEW YORK, N. Y.,
ASSIGNOR TO LEWIS R. CASE, OF SAME PLACE.
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Michael J. McCormick
1 of 2
IMPROVEMENT IN MODE OF VENTILATING AND ILLUMINATING RISERS.
Specification forming part of Letters Patent No. 38,788, dated June 2, 1863.
To all whom it may concern:
    Be it known that I, MICHAEL J. MCCORMICK, of the city, county, and State of New York, have invented a new and useful Improvement on a Ventilating and Illuminating Riser; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.
    The nature of my invention consists in making a riser of two parts or thicknesses, one behind the other, with apertures in each, alternately filled with glass, so that, by sliding one, openings for air will be made or closed at pleasure without seriously changing the amount of light transmitted.
    To enable other skilled in the art to make and use my invention, I will proceed to describe its construction and operation.
    In the principal part of my riser I fill the alternate apertures or alternate rows of apertures with glasses, B B. Along the lower margin of this principal part (the front of which is shown at Figure 1) I make a row of small apertures, c c c, to allow any rain or dirt working in between the two plates to escape outward over the platform or step.
    The back plate or sliding part of my riser I make with apertures for glass and air, corresponding with the principal part. The sliding part is of necessity shorter and also narrower than the principal part, but the apertures filled with glass, (see Fig. 2, B² B²,) and those unfilled, A A, correspond with those in the principal part. The lower of the sliding plate is arranged to rest lightly on the ledge F, which is attached to the front part, but is sustained mainly by pins or bolts P P, with or without sheaves or rollers, attached to the main part through slots E E in the sliding plate, allowing the same to be moved right and left at will. On the inside of the sliding plate are a system of grooves, G G, Fig. 3, running from top of bottom and between the apertures to conduct down and off through the small openings c c c in the main plate any rain or dirt which may be driven in between the plates.
Corresponding grooves may also be advantageously made in the principal plate to correspond with these. Now, when the riser is in place, it can be readily worked by the hand or by any known device of levers or cords and pulleys. When it is desired to have ventilation, the sliding part is moved until the unfilled apertures are opposite each other. Thus one-half of the apertures are open to the admission of air, while (as shown at Fig. 2) the glasses are also opposite each other. Now, when it is desired to exclude the air or storm, the back plate is slid until the apertures filled with glasses in the sliding plate are opposite to the unfilled apertures in that of the principal plate, and the unfilled apertures in the sliding plate are opposite the glasses in the front plate, and the weather this excluded, as shown at Fig. 3.
    Risers of blank material, or of gratings open or glazed, have theretofore been made, also sashes behind open gratings. These, with the riser itself have sometimes been hinged so as to let down and admit air, but all these methods are open to objection. The blank riser admits neither light nor air. The other plans admit dirt or accumulate it to be driven into the apartment whenever the openings are unclosed, besides exposing the premises to public view and to many nuisances and dangers. By my method the air is admitted through a great number of small apertures, and in such a way as to present an unobjectionable appearance, and when closed gives perfect security against rain or any nuisance. It is evident that circular rows of apertures may be arranged so as to let the sliding part move on a center, as with sliding ventilators for drafts to stoves, but I have fully described the method which I prefer.
    What I claim as my invention, and desire to secure by Letters Patent, is--
    1. The arrangement of a permanent perforated plate with a sliding plate similarly perforated, the alternate apertures or rows of apertures being filled with glass, in the manner and for the purposes set forth.
    2. The grooves G G upon the inside of one or both plates, communicating with the openings c c c in the front plate, substantially as specified.
MICHAEL J. MCCORMICK
Witnesses:
    J. K. INGALLS,
    T. C. GRAY.