Читать книгу Mechanics of the Household - E. S. Keene - Страница 45

—As a means of changing the dampers of the furnace from the floor above, to suit the prevailing conditions, the arrangement shown in Fig. 49 does away with the necessity of a journey to the basement, to remedy each change of temperature.

A plate is fastened to the wall at any convenient place, to which the end of a chain is attached as shown in the figure. This connects with a second chain, the ends of which are fastened, one to the direct draft or ash-pit damper F, and the other to the check draft E, in the chimney. As the furnace appears in the drawing, the direct draft is closed and the check draft is open. By changing the ring from G to H, the movement of the chain opens F, and closes E, admitting air to the furnace. When the temperature of the room is raised sufficiently, the drafts are restored to their original position by replacing the ring at G. Sometimes one or more intermediate points are made on the plate between G and H, which permits both drafts to be kept partly open and fewer changes are required to keep the temperature approximately normal.

Fig. 50.—Cross-section of damper regulator for steam boiler.

Fig. 51.—Steam boiler for house heating, with the damper regulator, in place, attached to the dampers.