Yes, a lady engineer solved Merlin -ve “g” fuel starvation problem, short term. A plate in the float bowl, with a small hole in it held enough fuel near the jet diffuser, with short term negative g, to prevent a cut, but hole was big enough to not impede normal ops fuel delivery, simple but clever! Later carbs were floatless, or had a type of injection system to deliver fuel to the jets I think.
The Bings on my Rotax, have a throttle butterfly, ahead of the moving piston and tapered needle. With choke on, throttle fully closed, the butterfly is fully closed. This exposes very small drilling’s only just past the butterfly plate, which are part of the choke circuit, because downstream of the fully closed butterfly plate, a suction exists (manifold pressure being lower than ambient, especially at idle) over these drilling’s, which suck up fuel, to enrich the mixture for start. If you crack the throttle slightly, the butterfly plate actually covers these holes, or moves past them, putting them in a pre butterfly plate high pressure area, so fuel is not sucked up, engine struggles to start.
Normal running. As I understand it, the throttle butterfly valve causes more air to come into the Venturi throat, this sucks up the piston, withdrawing the tapered needle from the jet orifice, leading to more fuel and air going into the induction manifold. The bottom of the piston forms the Venturi, creating a suction, constantly drawing fuel up past the needle taper, for higher power running. The Bings are cool carries, simple really yet reliable. I like the fact the Rotax config, gets the carb bodies nicely warmed up being so far back on the engine. That is why they rarely suffer carb icing. They are a lot like the old SU carbs on Brit sports cars. Wow, I did ramble on!