Circulation

Definition and stakes

James Wilson Hyde,  The Royal Mail: Its Curiosities and Romance

“ But intimately connected with that which was the original work of the Post-office, and is still the main work—the conveyance of letters—there is the subject of circulation, the simple yet complex scheme under which letters flow from each individual centre to every other part of the country. Circulation as a system is the outcome of planning, devising, and scheming by many heads during a long series of years—its object, of course, being to bring letters to their destinations in the shortest possible time. ”
Source: Gutenberg

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