The 1950s and 60s: the Golden Age of Immersive Cinema - Text 5
We might also note that most of these immersive systems did not stop at offering a larger image. Even though their advertising underscored the dimensions of the image, these systems often incorporated other technical elements: multi-channel stereophonic sound systems, speeded-up images, projection onto a curved screen, etc. In the beginning Todd-AO, for example, offered not just a wide 70 mm image but also a six-track multi-channel sound system, projection onto a curved screen and a projection speed of 30 frames per second. In many cases, as with Todd-AO, projection onto a curved screen at accelerated speed was quickly abandoned. It was already difficult for exhibitors to purchase 70 mm projectors and to equip their cinemas with new sound systems; very few could also install curved screens and modify their projectors for a faster projection speed. We should also point out that three-dimensional technology was rarely coupled with widescreen cinema. Each was offered separately.
