THE CANTERBURY PUZZLES
To re-arrange the numbers one to nineteen so that all the twelve
lines shall add up to twenty-three will be found a fascinating puzzle.
Half the lines are, of course, on the sides and the others radiate
from the centre.
36.—
The Donjon Keep Window,
On one occasion Sir Hugh greatly perplexed his chief builder.
He took this worthy man to the walls of the donjon keep and
pointed to a window there.
" Methinks," said he, "yon window is square, and measures,
on the inside, one foot every way, and is divided by the narrow
bars into four lights, measuring half a foot on every side.'*
" Of a truth that is so, Sir Hugh."
" Then I desire that another window be made higher up whose
four sides shall also be each one foot, but it shall be divided by bars
into eight lights, whose sides shall be all equal."
36
