ABSTRACT
In some houses it is not difficult to bring a four-inch wooden tube through the whole length of a partition from the top to the bottom floor of a house, and to let a supply of air enter that tube at the upper part, and distribute air to every room that lies in its course. While provision is made for the entrance of air, an equal provision should also be made for the escape of air. The safest method is to have the air of the room, a short time before it is occupied, brought up to a uniform temperature of from 60° to 65° Fahr. The box should be made of pine wood, and neatly planed on its inner surface. That surface should be polished with beeswax and turpentine so soon as the box is laid in, and from time to time the floor-board should be removed and the polishing should be repeated.
