398. Sectional Window.—A window built in horizontal sections of two or more with a spring or casing to hold it up—much cheaper than weights.
399. Adjustable Storm Door.—Devise a simple door which can be readily brought into place in time of storm, and which will be unnoticed or not seem unsuitable when not needed.
400. A Hinge Lock.—A hinge which operates as a lock, when the door is closed, and can only be opened by a key. Operated the same as a spring lock, but with less mechanism.
401. The Double Window.—Here is a plan for window ventilation. It is the idea of a French physician, but he has not patented it. Have a double window with openings at the bottom of one, and at the top of the opposite one through which the air comes in freely without any one feeling it. The plan is said to possess simplicity, efficiency, and cheapness. Let the American carpenter take notice and profit thereby.
402. Hot-Blast Furnace.—A small hot-blast furnace for drying walls. Builders who have to wait days for walls to dry call for such a machine.
403. The Weightless Window Sash.—When the window can be opened the desired width and kept there without the aid of a rope that finally breaks and involves trouble and expense, a great want will be supplied.
404. A Floor Cover.—Carpets are expensive; matting is not elegant. Discover something in place of both, cheap and ornamental, and you will reap one of the richest financial harvests of the century.
405. Sash Balance.—A system by which the force which holds the lower sash up may exactly balance the force which holds the upper sash down, both sashes being opened at the same width, and thus insuring both the outflow of impure air and the inflow of fresh.
406. Painting Machines.—Why may not painting as well as so many other modern arts be done by machinery? Something on the order of the garden-hose and spraying nozzle could do the work of the painter more rapidly, cheaply, and with less risk of life and limb. Inventors, give us a painting machine.
407. The Pneumatic Water Tank.—Instead of the unsightly water tank on the top of isolated buildings or country dwellings, with its liability of leakage and destruction of property, why not have a water tank in the cellar operated by means of compressed air? By being placed in the cellar or underground, there would be the additional advantage of having the water drawn cool and fresh. In winter also, it would be much better protected from freezing than when placed on top of a building. Some one will find money in a pneumatic water tank.