It was the name given to the receiver end of the Baird
mechanical TV system, used by the BBC before
Britland went out and started WWII.

30-line picture, transmitted in audio bandwidth.

A similar scanning system appears (from the nature
of the picture) to be used in some of the security
cameras that rely on detecting bodily emissions.
(Difficulty of getting a sensor that can work over the
area of a pictur)

Butch Magee wrote:
Plod's Conscience wrote:
My local garage is selling laser devices that project
a straight line for just under a fiver. I wonder if these
devices (with the lens removed so that they just
produce a single spot) could be modulated to be
the light source in a Baird Televisor?

Also, I wonder what is the smallest such Televisor
that has been produced?

What a Televisor?
KF5DE