Googling images of milking shed 1920s produces a photo of identical buckets being used to filter raw milk before it goes into the churn, an essential process I had forgotten about as a modern parlour does it automatically
Mike
Not being a bucket specialist I'll go with your expertise on this Mazi

I'm still scratching my head about that tool above our friend's head second from right. It looks like a long Lacrosse stick. It's a pole that splits into two above his hand much the same way a hay rake does, then at the top it also has a horizontal section attached to the two halves of the split pole with just a hint of teeth like a hay rake, but the head only seems to stretch in one direction above his head to the right, but just isn't there to the left. What an odd tool! I can't find anything similar on the net anywhere to compare it to. There is some damage to the photo in this area that confuses the situation even more.
Just to be expected in photo's of this age I guess, It is approaching a hundred years old after all
Also interesting that Carnation milk was made quite close by, I often wondered where that was made and who originally made it