Ringing the Changes.
Reading edition
It is curious to note the number of changes which may be rung on different peals. The changes on seven bells are 5040; on twelve, 479,001,600, which it would take ninety-one years to ring, at the rate of two strokes in a second. The changes on fourteen bells could not be rung through at the same rate in less than 16,575 years, and upon four-and-twenty they would require more than 117,000 billions of years.—E. F. King.