The description and uses of the general horological-ring: or universal ring-dyal Being the invention of the late reverend Mr. W. Oughtred, as it is usually made of a portable pocket size. With a large and correct table of the latitudes of the principal places in every shire throughout England and Wales, &c. And several ways to find a meridian-line for the setting a horizontal dyal. By Henry Wynne, maker of mathematical instruments near the Sugar-loaf in Chancery-lane.

4. The Divisions on each part.

One side of this Instrument according to fig. I. is thus divided. 1. The Cursor of the Meridian hath but one division or Notch as at O. 2. One half of the Meridian is divided into twice 90 degrees, which are again subdivided into halfs, and these halfs are distinguished from the Degrees, by a shorter line, these Degrees are numbered at every ten, from their middle O both wayes, by 10, 20, 30, &c. to 90, and in these Degrees are the Latitudes of pla∣ces reckoned when you would find the hour of the day. 3. The Aequinoctial is divided into

24 hours, and each hour is subdivided into eight parts, viz. halfs, quarters, and half quarters, and some of them have the hours divided into 12 parts, and then every division stands for five Minutes of time, whereof 60 make one hour, these hours are numbred with I. II. III. &c. to twice XII. from the two opposite points in the Meridian where this Circle is fastned. 4. On this side the Axis is divided into months and dayes, every division expressing 2 days, except in June and December, at which time the alte∣ration of the Suns course is almost insensible for several days together, these Months are known on one side the slit by these Letters, I. F. M. A. M. I. Signifying, January, February, March, April, May, June, on the other side by these, I. A. S. O. N. D. for July, August, Sep∣tember, October, November, December. 5. The Cursor of the Axis hath a little hole through it and a line a cross the hole, which line when it is used is to be set to the day of the Month.

The other side according to figure II. hath only the Meridian and the Axis divided 1. The Meridian hath a quadrant or 90 Degrees divi∣ded on it, whose center is at H. These Degrees are again subdivided into halfs, and this I call the Quadrant of Altitudes, it serving to give the Altitude of the Sun, by the shadow of a

pin, or such like wire, which shall be stuck upwright in the Center or hole H. 2. The Axis on that side the slit D is divided into twice 23 ½ and numbered both ways from the middle O by 10, 20, &c and this is called the Line of Decli∣nation, its use being to give the Declination of the ⊙, &c. On the other side the slit R, are divided four hours and a half, which are again subdivi∣ded, Numbred by IIII / 8 V / 7 VI / 6 VII / 5 VIII / 4 and this line is to shew the Sun's rising and set∣ting at London, but because it is particular this Line is left out in most Dyals. The Cursor on this side as on the other hath the little hole and a line a cross it.

Besides these divisions on each side, on the inside the Aequinoctial, in the middle, is a Line upon which is graduated the 24 hours, and parts agreeable to those on the side described in fig I.

Note that the Instrument thus made is gene∣ral, and will serve wheresoever you are, and therefore most proper for Seamen and those that Travel far. But for such as shall use them about these his Majesties Dominions, it will be sufficient to have but one Quadrant of Lati∣tudes graduated, and no more than 18 hours or thereabouts, viz. from 3 in the morning to 9

at night, and then the Instrument may be afforded so much the cheaper.