Odd Items In Pubs (Robin Hood's Bay Again)

Many years ago the late and brilliant Douglas Adams and John Lloyd co authored a book called "The Deeper Meaning Of Liff:A Dictionary of Things There Aren't Any Words for Yet-But There Ought to Be" , an updating of their earlier "The Meaning Of Liff" , which takes place names and assigns them to items that there aren't any words for.

While have tea in the rather Excellent Dolphin in Robin Hood's Bay , I saw the item below on the wall opposite me. I completely forgot to ask the landlord what it was , but it is definitely an appliance that would have a place in the afformentioned volumes!!