I found these 12 year old Nipkow Mechanical TV camera experiments on youtube
they're on troysvisualarts youtube
This is just one guy among many I found on youtube building their own variation of a mechanical camera. I don't know Troy. Interesting and educational from camera build concepts viewpoint. Part 2 etc will start automatically after the previous video
First is a camera build using a multiple CD plastic case painted black as the TV cabinet, an LDR for image sensor and a 35 mm camera lens. With LDR (Light Dependent Resistor) the resistance changes according to the intensity of light. Try mentioned having purchase a clear photo transistor which is more sensitive but didn't use it in parts 1-7. He may have use a photo transistor in the later camera/monitor in part 75 but I haven't watched all 75 videos.
Camera build Part1
https://www.youtube.com/watch?v=j0Gn3VSr_wQ
mechanical camera part 2
https://www.youtube.com/watch?v=baHgZXjUuv4
mechanical camera part 3
https://www.youtube.com/watch?v=BUYdSLGTljk
mechanical camera part 4
https://www.youtube.com/watch?v=pxVphfOLTng
mechanical camera part 5
https://www.youtube.com/watch?v=TTGGOSZVl1U
mechanical camera part 6
https://www.youtube.com/watch?v=yguYWDtOrio
mechanical camera part 7
https://www.youtube.com/watch?v=3xn8jQOEaX4
Jumping ahead a couple of years he experiments with a camera / monitor combination
32 line NBTV mechanical TV camera/monitor(Part 75)
https://www.youtube.com/watch?v=Pw2nf29unKE