in part one, what does chief bromden see in the "furnace"?

Here is a quote from Chapter 7,

I go to clawing at that damned sheet tied across me and just about have it loose when a whole wall slides up, reveals a huge room of endless machines stretching clear out of sight, swarming with sweating, shirtless men running up and down catwalks, faces blank and dreamy in firelight thrown from a hundred blast furnaces. 50 Ken Kesey one flew over the cuckoo’s nest It—everything I see—looks like it sounded, like the inside of a tremendous dam. Huge brass tubes disappear upward in the dark. Wires run to transformers out of sight. Grease and cinders catch on everything, staining the couplings and motors and dynamos red and coal black.