Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
My first is nothing but a name; my second is more small; my whole is of so little fame it has no name at all.
What is long and slim, works in light. Has but one eye, and an awful bite?
The stack just might be sent all over. Full of what's new, yet it's nearly obsolete.
What asks but never answers?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.