OneGuyFromBarlick

Is it for crushing stone?

Not stone Gloria but a hard substance. You are getting so close, think about china tea cups!

Bones?

Are the grinders for handling and refining the clay?

Gloria has got there. These are the grinding pans at Shirley's Bone mill where they calcified bones in a furnace and then ground them in water to produce a slurry that added the bone to the clay for fine bone china.
Now we need another object.

Can you tell me what this is?

Don’t know what it is, but there’s an interesting bit of scaffolding above the wooden trough.

That's a clue Gloria. The Lake District was under full renovation by English Heritage......

I’m stuck now.

Is it a simple lathe for stripping bark from narrow tree trunks?

You have got it Ian. Its the bed of one of the lathes at Stott Park, the Bobbin Mill restored by EH. Now we need another object!

What is it?

Interesting, but no idea.