Since the 1910s, glass slides were commonly used by exhibitors as ‘trailers’ to broadcast upcoming attractions and show times. Although the slides were gradually replaced by film trailers, they were still used in the 1970s.
A glass slide
Since the 1910s, glass slides were commonly used by exhibitors as ‘trailers’ to broadcast upcoming attractions and show times. Although the slides were gradually replaced by film trailers, they were still used in the 1970s.
