https://incinerama.com/ctorpheum.htm
Films promoted as being "In Cinerama" that played at the Orpheum:
THIS IS CINERAMA
Premiere: December 25, 1953
Engagement Duration: 84 weeks
CINERAMA HOLIDAY
Premiere: August 2, 1955 (West Coast Premiere)
Duration: 68 weeks
SEVEN WONDERS OF THE WORLD...
3p Cinerama was about 2.6.
The scenes with rear projection filmed in UP 70 did not look good in HTWWW.
The scenes from Raintree County filmed in MGM Camera 65 looked fine in HTWWW.
Below from Raintree County on the HTWWW Blu-ray