I'm curious what technology would have been available for public presentations and lectures around 1920-25, specifically on college campuses and in lecture halls.
I know that "magic lanterns" were known and used in the 1800's, but I'm not sure if a university classroom would ever be equipped with one. There seems to be a gap in projection technology between the magic lantern and the modern slide projector (ca. 1948).
In essence, I need to know if my character's lecture can be accompanied by projected images or if he needs to bring drawings and use a chalkboard.
I know that "magic lanterns" were known and used in the 1800's, but I'm not sure if a university classroom would ever be equipped with one. There seems to be a gap in projection technology between the magic lantern and the modern slide projector (ca. 1948).
In essence, I need to know if my character's lecture can be accompanied by projected images or if he needs to bring drawings and use a chalkboard.
