[r-t] Parity

[John David]

Parity
(Called the in and out of course when I started ringing and discovered this 
method, I am sure I was not the first, but when I sent it to the RW in ?1964 
no one said “I knew that”)

To find the parity of any row, for each bell count the number of bells below 
it which would be above it in rounds. The total is either even (“positive” 
or “in course”) or odd ( “negative”, “out of course”). No need for diagrams 
or calculators.

John David