In 1931 the Western Television Corp. developed a theater projection system and demonstrated it around the country in 1933. The following is from Peter Yanczer:
The rack on the right is the camera, obviously a flying spot scanner. On the left is his video amplifier. On the lower shelf you can see 6 tubes, which are the 845s. Behind them is a panel and behind that is another 6 of the 845s. I've seen his lens disk described as being 3 feet diameter and as 3 and a half feet diameter in size. Also, stated in this article is that the lenses were 2 inches in diameter. If that is correct, I believe the disk had to be larger than 3 feet. All things considered, a 3 foot disk would be too small.
Popular Science, October 1933
For more on this system see the February 1932 issue of Radio News and the November, 1931 issue of Everyday Science and Mechanics.
After the Western company closed its doors in 1933, Ulises Sanabria worked on a multichannel projection system. According to Bill Parker, an engineer with the company, there were multiple crater lamps, each illuminating a group of lines in the picture, resulting in a 120 or 150 line image on a screen up to 30 feet wide. The equipment was made by a company in Canada that built municipal water towers. The crater lamps were mounted on a copper strip.
The following is from a publication by Manuel A. Martinez, quoting a document written by U.A. Sanabria in 1966:
A 1936 brochure from National Schools in Los Angeles has a diagram of a water cooled crater lamp, designed to be used in projection systems: