Bob,
They are quite simple to operate
"You turns the handle, you gets the water "
Usually over your feet, if you stand in the line of fire !
They were common when I was growing up and were the only source of water in many rural areas.
In those happy days, not many houses had showers/baths ect, so these little units were good enough/
Often, they had a cast iron cup on a chain, which would be used by about 20 kids, one after the other !, and we are still all alive.
HSE ? Who are they ?