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THE DESCRIPTION and USES Of the General HOROLOGICAL RING: OR Universal Ring-Dyal.
1. Of the Name.
THis Instrument serveth as a Dyal to find the hour of the day, not in one place only (as most sorts of Dyals do) but generally in all Countries whether Northern or Southern; and therefore it is called the General Horological Ring, or Vniversal Ring-Dyal.
2. The Parts.
It consists of these parts, viz. 1. A little Ring and its slider to hang it by. 2. Two cir∣cles which fold one within the other. 3. A Dia∣meter a cross in the middle. 4. To this Diameter there is another slider.