The prohibition against more than two pirouettes lasted well into this century -- Bruhn was booed for doing four pirouettes in the second solo in Napoli in the late 1940s. It wasn't that they COULDN'T do them. It is because Bournonville thought they were vulgar. Brenaa was known for "bringing back" the trick of spotting. But Bruhn said he knew how to spot instinctively -- no one taught him. No vulgarity in Bournonville, nothing acrobatic, nothing showy. Maybe he gave them the helmets so they couldn't do more than two pirouettes

He made them sew a thread in the skirts so they couldn't lift the leg higher than he wanted it lifted.
An anecdote. On one of my first trips to Copenhagen, I was walking up Bredgade (one of the streets spoking out of Kongens Nytorv, where the Royal Theatre is located) and went into a courtyard. There, on the door, was Elfeldt studios -- Elfeldt was the court photographer who captured dancing Danes with his brand new movie camera in the very early 20th century. The studio is right down the street from the palace. I've always wanted to go back and knock on the door and see who's there now