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The practice of the wheel being behind the funnel dates back to the early years of paddle stemarers, when the bridge was just that, a bridge between the tops of the paddle boxes, on which the helmsman stood
Can someone confirm that the picture is of Sultan and not Williamson's Sultana (1868)? Most of my references are in temporary storage at the moment.I am fairly certain it is Sultan if it is the same photo that is in my "Glasgow and South Wstern and other Steamers" book. I think I used a magnifier when compiling the book and was able to read the name on the paddle box  Alistair Deayton