Each of the six smaller circles registered on a moving ribbon the indications of every successive moment, these ribbons when unrolled forming a perfect record of temperature, atmospheric pressure, wind, and so forth, in the form of a curve--a register kept for more than 8000 Martial years.
Four times during the revolution of the great circle each large clock emits for a couple of minutes a species of chime, the nature of which my ignorance of music renders me unable to describe:--viz., when the line dividing the green and black semicircles is horizontal at noon and midnight, and an hour before, at average sunrise and sunset, it becomes perpendicular.

The individual character of the several chimes, tunes, or peals, whatever they should be called, is so distinct that even I appreciated it.

Further, as the first point of the coloured strip distinguishing each several _zyda_ reaches the golden indicator, a single slightly prolonged sound--I fancy what is known on Earth as a single chord--is emitted.

Of these again each is peculiar, so that no one with an ear for music can doubt what is the period of the day announced.

The sound is never, even in the immediate vicinity of the clock, unpleasantly loud; while it penetrates to an amazing distance.
It would be perfectly easy, if needful, to regulate all clocks by mechanical control through the electric network extended all over the face of the planet; but the perfect accuracy of each individual timepiece renders any such check needless.