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FIrst open the (Joynt of the) Rule, then upon the head-leg, being next to your right hand, you have a line beginning at the hole, which is the Center of the quadrantal lines, and divided from thence downward toward the head, into as many degrees as the Suns greatest
altitude in that latitude will be, which with us at London is to 62 degrees; which line I call the Scale of Altitudes, divided to whole, halfs, and sometime quarters of degrees.
2. Secondly, On the other leg, and next to the inside is the line of hours, usually divided into hours, quarters, and every fifth minute, beginning at the head with 4, and so proceeding to 5, 6, 7, 8, 9, 10, 11, and 12 at the end, and then back again with 1, 2, 3, 4, 5, 6, 7, 8, for the morning and afternoon hours.
3. Next to this is a Kalendar of Moneths and Days in two lines; the uppermost contains that half year the days lengthen in, and the lowermost the shortning days, as by the names of the moneths may appear; the name of every moneth standing in the moneth, and at the beginning of the moneth: and all but the two moneths that have the longest, and the shortest days, viz. Iune and December, are divided into single days, the tenth day having a figure 10, or a point or prick on the head of the
stroke, and the fifth onely a longer stroke without a prick, and the begin∣ning of every moneth a long stroke, and every single day all alike of one short∣ness, according to the usual manner of distinguishing on lines.
4. And lastly you have a line of de∣grees, for so they be most properly cal∣led, and they are the same with the equal limb on quadrants, and serve for the same use, viz. for taking of Alti∣tudes, or Horizontal Angles, and are di∣vided usually to whole, and half de∣grees of the quadrant, and figured with 30, 40, 50, 60|0, 70|10, 80|20, and 90, just on the head, cutting the center or point, where the Scale of Altitudes and the Line of Hours meet; which point, for distinction sake, I call The rectifying point. And the reckoning on this line, as to taking of Altitudes, is thus: At the number 60|0 is the be∣ginning, then towards the head count 10, 20, 30, where the 90 is; then begin at the end again, & count as the figures shew you to 90 at the head, as before.