Quote for 17 February 2021
We have sounds of the bells. We try in the case of each sound to find itsequal. This we call pairing. I might do an exercise by mixing them all upand then pairing them. This is a search we carry out. It is possible to seekout in a number of bells the two which correspond directly. There is noneed for preparation, anybody can begin this; this is only a gradation ofsound.