it's a shame so many original Registration drawings are bereft of dimensions, and I agree that at 2" this would seem too small to be a sugar - but as you can see from the original drawing (I hope, but rather blurred) - this is precisely what it was called by the factory - "New shape sugar".
The Reg. is No. 362736 - and there's nothing in the spread of the other numbers from that date, that looks to come close to this design.
I can remember aloooominum churns from my childhood that were simply upright and tubular in shape, and dating to circa the middle of the C20, but assume that some late C19 copper or brass ones ones were conical. Oddly, the factory drawing and Roy's example, show the narrowing in opposite directions.
I can understand Thompson's description as refecting the shape shown in the original factory drawing, but looking at this thing in the flesh, it reminds me more of the shape of a pail (minus the handle of course). Obviously, some artistic licence between the original drawing and how it eventually turned out.
In view of the obvious difference between the drawing and the real thing, I'll try in the coming days to show all of the other items in that day's Registration list - which will confirm this as 362736.