Whiting Cupola
A patented cupola manufactured by the Detroit Foundry Equipment Company, Detroit, Mich. Among many special excellences claimed for this cupola are the following: (the special features over other cupolas are largely in the arrangement and construction of the patent tuyeres): "There are two rows of tuyeres. The lower ones are arranged to form what is practically an annular air inlet, thus distributing the blast almost continuously around the entire inner circumference of the cupola. These tuyeres are constructed in such a way that the blast is admitted through the small end, which is expanded into a large horizontal opening. This allows the blast to reach the iron through an opening nearly double the area of that through which it enters, thereby admitting the same volume of blast, but softening its force. The result is a better, softer, and more fluid iron, even in quality and easy to work. A sharp, uneven blast destroys the best qualities of iron. The cupola has an upper row of smaller tuyeres of similar construction, and of sufficient size to furnish air to utilize the escaping carbon gas. As we employ a slag-hole, the melting in our cupola may be continued indefinitely."