While Doug has specified Rudge-Whitworth, there was also the RAF system which I think is the non-RW arrangement shown in post 7. I can't immediately find a suitable reference (Google seems to think I'm asking about an Air Force!) so can't say when it appeared.
One of the features of the RW is its self-tightening which is remarkably effective.
Allan, in the article from which I posted the photos in post 7 clearly mentions that when Mr Hickling cleaned up the two locking rings shown on the wheel in the top photo, they were marked "Rudge Whitworth Detachable Rim"
On further investigation these hubs in the photo are called a "Type 1"
"Type 2" came out in 1910 with the same very course spline but a slightly easier to use retaining nut system.
The "Type 1914" was released in ... wait for it ... 1914 with an 80 mm fine spline much more like the type of spline we know and love today.
Easier to pick as this later type seems to be the first to include a "locating bell" for the wheel to locate on the inner hub face. Which is why the inner wheel flange is always larger than the outer hub face.
Daimler Motoren Gesellschaft offered the Type 1 wheel as an option from 1908, but the RW became more common throughout their range from 1912. The wooden wheel actually became the option from that point on. But I dare say many more wooden wheeled Mercs were sold - probably because of purchasers hesitancy about anything "new-fangled"!
The 1908 Tourist Trophy Hutton hub is parallel across the width of the wheel. ie - Inner diameter the same as the outer - therefore showing it to have the Type 1 RW wheel.
Edited by Porsche718, 14 May 2022 - 02:25.