OneGuyFromBarlick

Yes sir! I know!

And me too ...

I thought you would, let's see if anyone else has a crack at them..... (It's very hard finding these 'mysteries'!)

Me too.

I've no idea

Man size 'Slinky' springs. Slinky.. I know they're not but it was a fascinating toy.

I reckon I know as well.

They make poor imitations of real Slinky's out of plastic now, not enough weight to make them walk properly.

I'm sure I should know what they are - but can't recall where I've seen them! They look like they're used for their flexibility rather than springiness.

If they are what I think they are you are on the right track Tiz.

For cleaning drains?

Pipe bending springs.

An aye from me

They remind me of washing machine water outlet pipes, but obviously not long enough.

I'll go with Kev's pipe bending springs.

Me too!

That's what they are, solid springs that you insert in the bore of a pipe before bending it. They stop the walls of the pipe collapsing and if you give the loop in the end a slight turn in a clockwise direction it lessens the diameter of the spring slightly to aid withdrawal. Different sizes for different bores of pipe. Used with a pipe bending machine they enable you to get almost perfect bends.
Incidentally, my mate and I once had to bend a 12" diameter pipe for use in a steam main. We filled it with sand and sealed it to support the walls then bent it with block and tackle while heating it red hot with big oxy-acetylene rose burners. Exciting stuff!
Next for shaving?

Try this oldie!

No idea, but I'll hazard a guess. Is it for knocking the head of something in / flat?

No Gloria it's more a precision tool but not for measuring.

The underside of an old brass spirit level?

It looks like a punch for rounding the heads of rivets but you have already dismissed that. Hardly a precision tool either.

Tyre pressure gauge.( or some sort of pressure...maybe in a boiler?)

A Plumb Line

Sorry. nobody has got it yet. I'll give it one more day.....

Hydrometer