Seth Thomas Sonora chime (dual chime)

The sonora chime by Seth Thomas that has dual chimes (whittington
and westminster ) has 2 small dials about 1 ½ inches in diameter on the top of the
face . One of them is for the chime selection and the other is for the timekeeping
adjustment. The mainspring in the chime unit is larger than in the single chime
unit; it’s dimensions are: strength: .00215inches by 1.375 inches wide by approximately
106 inches long. The sequence of the hammers is as follows: looking in the back of the
case assign numbers to the hammers and let the hammer closest to the back be #1 .
The wittington sequence is as follows at the quarter hour chime: 1, 4, 6, 7, 2 ,3 ,5 ,8.
The westminster chime at the quarter hour is: 6, 7 ,2 ,8.