[78-L] Concrete Pathes

[Anthony G Pavick]

In the Pathe thread, I made mention of and linked to the 'concrete' 
Pathe disks.

 From what I have been able to tell, they are essentially a round 
piece of cement that has been laminated/ wax coated, and have a paper 
label stuck on one side. That's about all I know about them, though.

So -- questions:

Why cement? Surely to make a rudimentary somewhat sturdy disk, I'd 
have thought that something else would be used like maybe wood? Hmmm 
-- were any disks ever made with a wooden core?

Also --

How thick were they? How much did they weigh?

T