Bobby Ellerbee comments:
“Before there was video tape, tele transcription was done via the kinescope process. Inside the cabinet, behind the panel door there is a cathode ray, or picture tube pointing up so the image can be seen via the mirror box. The image is then recorded by a small film camera as seen here with the film magazine above it. The operator can adjust the picture quality and audio with the oscilloscope and control panels shown here.”
Source: Eyes of a Generation.