The problem in the Merlin carb was the fuel resevoir/float tank.
It's pretty much like the cistern on a toilet. With a float/valve system to refill
Fuel sit's in there and the supply to carb is taken from there. It's done purley by gravity. In negative G the fuel moves to the wrong end of the resevoir and so starves the engine.
Miss Shillings work around was a metal plate with a hole in it that slowed the liquid movement down. It didn't completely get rid of the Neg - G problem but it gave you more time before the fuel emptied from the resevoir
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