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. XXXI. How to make a Direct North Dial for the Cape of Good Hope, in South Lati∣tude 35 d. and Longitude 57 d. to the Eastward of Flores and Corvo.

THis Dial is made all one as the South Dial you may see Chap. 9. Only observe this, That you are 35 deg. to the Southward of the Aequinoctial, and that the Sun, when he is on the Tropick of Capricorn, wants 11 ½ Degrees of the Zenith of that Place Northward: As the Sun goes always to the Southward of us in England, so it goes to the Northward of them; therefore must the Stile or Gnomon point downward in the North Face, and upward in the South Face. So likewise as in our South Dial the afternoon Hours are put on the East side the Dial Plane, and

the morning Hours on the West side; so in their North Dials they will stand con∣trarily, by reason the Sun casts a Shadow (as the Plane must stand there) in the morning to the West side, and in the afternoon to the East: So you see the Plane is only turned to face the Sun. If you do but conceive in your mind how the Sun

[illustration] geometrical diagram

casts his shadow, you may as easily make all sorts of Dials on the South side of the Aequinoctial, as on the North side: but that the People there have neither Order, Po∣licy, Religion, nor Understanding in Mathematical Arts or Sciences. The Africans at the Cape of Good Hope are of a swarthy dark colour, and made black by daubing them∣selves with Grease and Charcoal; they are so wedded to superstition, that some adore the Devil in the form of a bloody Dragon, others a Ram, a Goat, a Leopard, a Bat, an Owl, a Snake, or Dog, to whom they ceremoniously kneel and bow. So much for Aethiopia, and for Dials for them; only you see the manner, and that the former Rules serve for any Latitude.