I think that just to confuse the issue further, old aircraft before the "turn and slip" needles presentation with the slip at the top, had a inclinometer with a bubble in a curved tube where the ends of the tube curved downwards at each end. Trying to remember not to "step on the bubble" but the reverse was seriously difficult in an Albatros DVa replica. The comment about leading with the rudder was very true. The rudders on aircraft of that vintage were quite powerful due to the small fins but as someone once said of the Sopwith Camel with its huge ailerons, the primary effect of ailerons was adverse yaw and only secondarily of roll. The bubble, which was not well damped could go from one end of the tube to the other in a flash. It was easier to do it by the feel of the wind on the side of your head!