Acetylene oxygen torch rose buds are great when you need a lot of heat like when you want to heat a thick piece of metal cherry red hot to bend it easily or forge it, these were not made to be able to adjust too low, and would not be good for melting gold in a dish, but if you already have the gold melted and need more penetrating heat over a wide area like when trying to make a bar in a mold changing to a rose bud can give you the heat needed to get the bar and mold hot enough, the rose bud can also be used like a burner in a furnace where the burner flame heats up the whole furnace and the flame heats the whole crucible from the outside the large forceful flame needed to heat a large area and penetrate deep through thick material to melt gold in the crucible, but where the forceful whirling flame does not blow down into the crucible to blow the material out before it can be melted.
Sometimes I use the cutting torch without using the oxygen lever; in this fashion it can act like a rose bud torch, with good torch use and control you can melt gold in the dish.
I believe Harold used a rose bud, but he must of used one for jewelers (just me guessing here), these are most likely different probably much smaller, than the ones we use for heating thick steel with that the acetylene oxygen torch was designed for.
