This chapter was called A Nickel-Plated Emperor in the book because in this chapter, the Tin Woodman revealed that after becoming ruler of Winkieland, he had "lately caused himself to be nickel-plated." So that he wouldn't rust anymore.

But the thing is that tin doesn't rust. Most stuff called "tin" in Baum's day was actually tinplate: steel or wrought iron coated with a thin layer of tin to impede rust. In Alexander Volkov's "Magic Land" books, The Tin Woodman was renamed The Iron Woodman because of this. If The Tin Woodman was tinplate rather than pure tin, that would explain why his joints could rust.

A nickel plating over a tin plating seems redundant to me, but not obviously redundant enough to work as a joke.

So, I, uh... so, I changed the chapter title.

Why he's standing in that position instead of in the middle of chopping down a tree, I'll explain in a later chapter.