[Mike K]

I had a box full of the special bulbs OSRAM brand . 10 volt I think. I posted the bulbs to a chap in the UK he was teaching boy scouts Morse code with those lamps . Aussie disposals had WW2 dated NOS tripods back in the 1980s I bought two of them. The Australian lamps were made by PMG from memory , the box is not like the UK made sets in that it sort of looks like a thin casting rather than sheet steel. Morse speeds were limited because of the slow acting filament in the bulbs typically 10wpm or less. We had two set up at Corowa years ago . A ex army chap told me during training in Tasmania his unit would set up Aldis lamps between Launceston and Hobart , from Mt Barrow they would relay from mountain tops down to Mt Wellington , at night the range of these lamps was amazing. The larger type lamps are less common.