A short treatise of dialling shewing, the making of all sorts of sun-dials, horizontal, erect, direct, declining, inclining, reclining; vpon any flat or plaine superficies, howsoeuer placed, with ruler and compasse onely, without any arithmeticall calculation. By Edvvard Wright.

CHAP. XIIII. The drawing of the houre lines in all Dials that bee not Equinoctiall. (Book 14)

HAuing thus, deuided the Equinoctial cir∣cle, lay your ruler to the center thereof B. and to euery one of those prickes 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉 by which it is deuided, and make marks 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉 &c. in euery place where it crosseth the line of contingence for then

2 In all polar Dials paralels to the substilar line, drawne by those markes, shall bee the houre lines, as in the 3. 4. 6. 7. 8. figu.

3 In Dials not polar, in which the height of the stile is not augmented, right lines drawne out of the center of the dial by those markes shal be the houre lines as in the 9. 11. 13. 14. 15. 16. 18. figu. And if any of the diuisions of the aequinoctiall circle doe fall in to the substilar line, a paralel to the line of contingence drawne by the center of the said diall, shall shew two opposit houres, distant by the space of six houres from the substilar line; as for exam∣ple in direct Dials, six in the forenoone and six in the afternoone, as in the 13. 14. 15. figure. Also if the ruler laid to B. the center of the Equino∣ctial circle, and some diuision thereof, as V in the 16. and 18. figu. cannot crosse the line of contin∣gence, and yet draweth neerer to it,: draw BY. a right line from the center of the Equinoctial by that diuision, and draw AF a paralel to that line,

which may crosse the substilar and line of contin∣gency in F. then let HA. the other part of the sub∣stilar that is betweene the line of contingence and the center of the dial A. be cut in such sort that the segments, of the substilar line concurring at the line of contingence AH and HB. may keepe the same proportion which the greater segments BH. and HA. haue, which are contained betweene the cen∣ter of the Dial and line of contingence, and betwixt the center of the Equinoctiall and the line of con∣tingence. And let aright line BF. bee drawne by that section B and the section of the line of contin∣gence F. For AI a paralel to this right line drawne out of the center of the Diall shall be the houre line that wee seeke for.

4 In those dials wherein the distance of the stile from the substilar is augmented, right lines drawne by those markes in both lines of contingence which are proportionately distant from the substilar line shall be the houre lines.