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A44898 An appendix to Clavis horologiæ, or, An explication of the pyramidical dyal set up in His Majesties garden at White-Hall, anno 1669 in which very many sorts of dyals are contained ... / by the Reverend Father Francis Hall, otherwise Line, of the Society of Jesus ... Line, Francis, 1595-1675. 1685 (1685) Wing H331; ESTC R213613 25,626 77

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whose Title is Per Terram shews what of the Clock it is in any part of the World which is here performed by a Geographical Description of the whole Earth upon the inward superficies of the Bowl together with a Meridian-circle moveable upon the North and South Poles and the Equinoctial circle divided into its 24 equal hours and fastned to the said Meridian at the hour of Twelve at which place also is erected a Flower-de-luce and at the North-Pole is fastned a Thred The Bowl being thus prepared and rightly placed if you turn the said moveable Meridian till the Flower-de-luce cast no shade upon the Bowl and then bringing the Thred over any part of the World till it cross the Equinoctial-circle you shall see the hour there noted belonging to that part or parts of the World over which the said Thred passed according to the Verse there adjoyned Vmbram tolle Orbi totumque stat Hora per Orbem CHAP. V. Of the Four great Globes standing on the First Piece Of the First Globe THE First therefore of these Globes whose Title is Horologia Geographica having about Thirteen inches in diameter hath its superficies cut into thirty two Planes whereof twenty are Triangles all equal and equilateral the other twelve are Pentagones or five angled Figures all of them likewise equal one to another Some of these Pentagones are made hollow like Hemispheres others like Cones the rest as also the Triangles are left plain The Dyals described as well on the Pentagones as on the Triangles have for style a sharp-pointed Iron perpendicularly erected The Dyals described on the Pentagones shew not only the situation of the more remarkable Countries in the World but also what several actions are performed in them at the same time for example who are now at Dinner who at Supper who are rising who sleeping c. Fig. 18. For those two whose Title is Tempus surgendi shew by the shade of the style in what part of the World it is time of rising or six of the Clock in the Morning Fig. 19. Those whose Title is Tempus Prandendi shew in the same manner in what part of the World it is time of Dining or Mid-day Fig. 20. Those whose Title is Tempus Coenandi shew in what Countrey it is Supper-time or six of the Clock at Night Fig. 21. Those whose Title is Tempus Dormiendi shew where it is Midnight or time of sleeping Fig. 22. But those two whose Title is Habentes Solem supra Caput shew by the shade of the style what People whether by Sea or Land have the Sun just over their Heads at such a time as you look upon the Dyal which is performed by inverting that part of the Terrestrial Gobe which is included between the two Tropicks The Reason of which inversion is that the shade of the style being always cast towards the contrary part to the Sun that is if the Sun be East the shade falls towards the West c. it was necessary the Eastern part of the World should here lie Westwards and the Northern Southwards And thus much for the twelve Pentagones described on the Globe Fig. 23 24. Now for the twenty equilateral Triangles the Dyals described on them shew only what of the clock it is in this or that particular place according to the usual way of counting the hours from Midnight to Noon and from Noon to Midnight whereof only three Examples are here set down thus one of these Dyals shews what of the Clock it is at Jerusalem another at Constantinople another in Jamaica c. Of the Second Globe THE Second Globe whose Title is Horologium Astronomicum ostendens c. is just like the former whereof we have now spoken that is the superficies thereof is cut into twelve Pentagones and twenty Triangles but the Dyals described on these Pentagones and Triangles are much different from those of the former as not only shewing the hour of the day but divers other things belonging to Astronomy as the Azimuth or distance of the Sun from the South the Almicantarath or height of the Sun above the Horizon what hour he rises and sets and the like of which are now to treat Fig. 25. 1. The Dyal whose Title is Azimuth Solis a Meridie shews by the shade of the style which in each Dyal here also is perpendicularly erected how many degrees the Sun is distant from the true South at such time as you look upon the Dyal The Lineaments of this Dyal are no other than the Sections which the Plains of the vertical Circles crossing each other on the top of the style make with the superficies of the Dyal Fig. 26. 2. The Dyal whose Title is Altitudo Solis supra Horizontem shews how many degrees the Sun is elevated above the Horizon The Lineaments of this Dyal are the Sections which the superficies of the Dyal makes with those cones whose bases are parallel to the Horizon and whose common vertex is the top of the style or center of the Earth Fig. 27. 3. The Dyal whose Title is Incipit Aurora shews at what hour begins Break of Day that is when first the Crepusculine Arch begins to appear The Lineaments by which this is here performed are the Sections which the superficies of the Dyal makes with the cones whose bases are parallel to the Equator and whose common vertex is the top of the style or the Earths Center Fig. 28. 4. The Dyal whose Title is Sol oritur shews by the now named Sections of those Cones whose bases are parallel to the Equator at what hour the Sun riseth and by consequence when he sets Fig. 29 30. 5. The Dyal which hath for Title In quo Signo Zodaici sit Sol shews by the said Sections of the superficies of the Dyal with the Cones whose bases are parallel to the Equator in what part or sign of the Zodiack the Sun is but because the shade of the top of the style falls twice every year upon the same Section by reason of the Suns ascending and descending from the one Tropick to the other therefore to avoid confusion there are two Dyals of the same sort one serving from the 10th of December to the 10th of June the other from the 10th of June to the 10th of December Fig. 31 32. 6. The Dyal whose Title is Dies Mensis shews by the like conical Sections now mentioned what day of the Month it is at least as near as can be expected in so little a form Here are likewise two Dyals of the same sort for the reason now mentioned And these Dyals within this second Globe we have hitherto spoken of are all of them described on the Pentagones Those which follow are described on the Triangles Fig. 33. 7. The Dyal whose Title is In qua parte Horizontis incipiat Aurora shews in what part of the Horizon begins the Break of Day that is in what part thereof begins first to appear