Damper
A very useful and profitable device in a foundry oven, when intelligently managed. A right knowledge of its use saves both time and money to the founder. Frequently none are employed; and not unfrequently, at places where dampers were originally intended, they have been allowed to lapse into desuetude through sheer and unwarrantable neglect. Let a good-sized chimney, controlled by a full damper, be placed if possible central with the oven at the roof, and one on each side, diagonally, at the bottom, with these. Careful attention will discover in what manner to best rid the oven of steam, at the same time losing no heat. By constant application to find a satisfactory solution of the above problem, ovens with absolutely no record may easily have their value increased a hundredfold. See OVENS.