Looked things up for accuracy and this is what I found when reading this article:
Prior to electric televisions, we had mechanical televisions.
These early televisions started appearing in the early 1800s. They involved mechanically scanning images then transmitting those images onto a screen. Compared to electronic televisions, they were extremely rudimentary.
And here's a rough explanation of how it worked:
Mechanical televisions relied on rotating disks to transmit images from a transmitter to the receiver. Both the transmitter and receiver had rotating disks. The disks had holes in them spaced around the disk, with each hole being slightly lower than the other.
To transmit images, you had to place a camera in a totally dark room, then place a very bright light behind the disk. That disk would be turned by a motor in order to make one revolution for every frame of the TV picture.
Baird’s early mechanical television had 30 holes and rotated 12.5 times per second. There was a lens in front of the disk to focus light onto the subject.
Obviously mechanical TV's don't exist anymore but they were developed long before the electronic TV's were made and even longer before they were sold commercially.