In the Ader transmitter as many as twelve carbon pencils were employed, arranged in a series of two groups with six pencils in parallel in each group. These were supported at their ends in parallel carbon bars, which were carried by a nearly horizontal wooden diaphragm.
And all these groups, while talking among themselves, tried to keep near the commander-in-chief (whose bench formed the center of the gathering) and to speak so that he might overhear them.
Groups of people will do science this same way.
Groups of singers stood outside the windows.
I never had patience to arrange more than five or six groups at a time.
