In fact, he only claimed to be the first to coin the term “vacuum cleaner” for devices of this nature, which may explain why he is so credited. As we all know, the term “vacuum” is an inappropriate name, because there exists no vacuum in a vacuum cleaner.
Rather, (1)it is the air moving through a small hole into a closed container, as a result of air being blown out of the container by a fan on the inside. But I suppose a “rapid air movement in a closed container to create suction” cleaner would not sound as scientific or be as handy a name. Anyway, we are stuck with (2)it historically, and it is hard to find any references to “vacuum” prior to Booth.
What does it refer to each? Really confusing. .