The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.

CHAP. XX. To draw the Proper Hours of any Declining Dial.

EVery declining Plane, whether it recline or not, hath two great Meridians much spoken of.

1 The Meridian of the Plane, which is the proper Meridian of that Country to whose Horizon the Plane lieth Parallel.

2 The Meridian of the Place, which is the Meridian of our Country in which you set up this Declining Plane, to shew the Hours; and so either of these Meridian Dials may be conformed.

How to draw the Hours of our Country on such a Plane, is the harder work, be∣cause

the Plane is irregular to our Horizon: yet I suppose I have made the way very easie in the former Chapters. But to draw the Hours of the Country to which the Plane belongs, is most easie; for if you take the Substiler for the Noon-line, and the Elevation of the Pole above the Plane for the Latitude, you may make this Dial in all points like the Vertical Dial, after the Precept of Chap. 8.