I found this on an organ I played recently. It is not just a guide to the note names, for a non-musician, which fits snugly over the keys. It actually tells the note holder what order to play the notes in so the tuner can do his setting out.
Starting with C he would go up to G and tune a perfect 5th, then from G to D a perfect 4th (although he would need to count the beats.)
Then the order is A, E, B, F#, C#, G#, D#, A#, and finally back to F. Organ tuners use sharps, not flats, as the pipes are set out on natural and sharp sides. Since equal temperament means that the octave cannot quite be divided equally, the skill of a tuner is to place the 'weirdness' where it does least damage; usually spread evenly over the octave. Bach proved this was possible when he wrote the "48"
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