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A67225 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. Wynn, Henry, d. 1709. 1682 (1682) Wing W3778B; ESTC R221060 10,231 45

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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 London Printed by A. Godbid and J. Playford s for the Author 1682. TO THE READER I Formerly published half a Sheet on this Subject and having disposed of all I printed I found my self necessitated to Print more to gratify those who bought the Instruments of me but considering with my self the scantiness of that paper I took the pains to write a larger which should be more effectual and as I hope will give better satisfaction 'T is confest that there is very little new in this as in most other Books written now a days but what may be found among former Authors My chiefest care herein hath been to collect and alter so that it might serve my present purpose As for the Instrument it self being carefully made and graduated as is here described I know of none for Portableness Universality and exactness that doth exceed it I mean with respect to its finding the hour whereby it becomes absolutely useful for any Gentleman to carry in his pocket or to rectify his Watch or Pendulum by it c. I have endeavoured to be as plain as possible for the sake of young beginners that the reading of this might Create in some a farther Inclination to the Mathematicks which I heartily wish may flourish not only as they are my Trade and consequently it is my Interest to promote them but because they are of so great and general use and advantage to the Kingdom H. W. 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 circles which fold one within the other 3. A Diameter a cross in the middle 4. To this Diameter there is another slider 3. The Name of each part The names given to the parts are 1. The little Ring and its slider is called the Cursor of the Meridian and is represented figl by the letter Z. 2. Of the two Circles the outermost M M M M is called the Meridian and the innermost Ae Ae Ae Ae is called the Aequinoctial 3. That which crosseth the middle noted with A A is called the Bridge or more properly the Axis 4 The slider within it noted C is called the Cursor of the Bridge or Axis 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 places 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 alteration 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 September 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 divided 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 Declination 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 subdivided Numbred by IIII 8 V 7 VI 6 VII 5 VIII 4 and this line is to shew the Sun 's rising and setting 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 general 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 Latitudes 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 Vses of the Instrument THe Principal Uses of this Instrument although larger may be made to perform many more are as followeth 1. Knowing the day of the month to find the Suns Declination 2. To find the Altitude of the Sun at the Meridian and all Hours 3. By knowing the Suns Declination and Meridian Altitude to find the Latitude of any place 4. To find the hour of the day 5. To find at what time the Sun rises and sets on any day at London or any other place lying under the same Latitude 6. To find what days and