Quiz.

[Bodd]

Yorkshire

 

[transam]

I bet it was on an island ?

Isle of Wight

 

[transam]

Shetlands ?

 

[transam]

Orkney islands

 

[Mottie]

Isle of woman.

 

[crystal ball]

Isle of woman.

Sort of correct

 

[Bodd]

Isle of Dogs

 

[JohnD]

Isle of Man, of course.

 

[crystal ball]

Isle of Man, of course.

Correct

 

[JohnD]

My go.

There used to be two items that, throughout the world, used the same screw thread.

Even in America, China, Europe, Japan, Russia and Britain.

Now there is only one.

What is it, and why is it now almost (but not quite) exactly the same as it was a hundred years ago?

Supplementary question:
What was the other one?

 

[Ihavenojob]

Something to do with ships, a ships wheel or propeller ?

 

[JohnD]

nope

 

[Mottie]

On a vice?

 

[JohnD]

nope

 

[Mottie]

Archimedes screw?