The Ouimetoscope was built in 1906 in Montreal and expanded to a 1,200  amphitheatre in 1907. No Nicholson letters mention this place, just "the Nickel" and The Orpheum ( a vaudeville house which was part of a circuit). Below is a snapshot my husband took of what remains of the Ouimetoscope in 2005. It's a noodle house with a plaque.  It's on St Catherine E in the gay village, near the CBC. At least they put up a plaque. Most of Montreal's beautiful movie houses have been demolished.  Dane Lanken, married to Anna McGarrigle, the singer, I believe, wrote a beautiful book about Montreal's movie houses. (Penumbra Press). You can find era pictures online, just enter Ouimetoscope into Google images. Read all about a Respectable Nickelodeon in 1910 Montreal.