With another IF Allman up and running on a temporary burner I thought it best to show mine here so other builders can join in.
Starting with the valve that controls the gas that the engine uses to run, the flow of which is controlled by the governor on the patent but I did not find it very effective on mine
After fettling the cast brass body was machined with a combination of lathe and mill, here I opted to machine the round flanges to hexagons
A short length of pipe connects the gas valve to the inlet valve block, the top plug and valve spindle are plain turning jobs
The burner was made from three pieces of brass silver soldered together, the main body was drilled to fit over the hot tube and a recess for the top plate bored in the lathe followed by milling a horse shoe shaped recess for the gas passage, the metal between the ends of the horse shoe was cross drilled and tapped for a grub screw so the burner could be clamped to the hot tube at the desired height. the top plate was just a turned brass "washer" and then a threaded union for the gas piping goes into a hole on the opposite side.
After silver soldering together I mounted my small Unimat 3 indexing head at an angle of 15degrees and drilled the ring of holes so that the flames were directed towards the hot tube.
With the burner mounted two commercial 1/8" BSP elbows were used to dogleg the route down and away from the line of the gas valve.
I wanted to use the Sievert burners jet to get the right gas flow to the burner so the end of one was unscrewed and a piece of brass bored and threaded to make an adaptor, here you can see the Sievert burner being used to check the screwcut thread.