A Practical Treatise of Perspective, on the Principles of Dr. Brook TaylorLeigh & S. Sotheby, 1806 - 313 páginas |
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Página 77
... diagonal must be found and employed . The better to explain the foregoing inftructions , let the under figure be confidered as representing the geometrical elevation of the bafe of a pedestal , together with its plan ; the mouldings of ...
... diagonal must be found and employed . The better to explain the foregoing inftructions , let the under figure be confidered as representing the geometrical elevation of the bafe of a pedestal , together with its plan ; the mouldings of ...
Página 79
... diagonal lines e h , and i 1 , in the points X , X 1 ; which points will be the mitre angles of the perspective projection required ; from those points draw the lines w 1 , w 2 , parallel to the horizon ; and thofe lines will produce ...
... diagonal lines e h , and i 1 , in the points X , X 1 ; which points will be the mitre angles of the perspective projection required ; from those points draw the lines w 1 , w 2 , parallel to the horizon ; and thofe lines will produce ...
Página 80
... diagonals vanishing in the points of distance ; confequently , thofe diagonals can be obtained by draw- ing lines through the angles from the points of distance , as the line through e and i , from the point of distance D , or through g ...
... diagonals vanishing in the points of distance ; confequently , thofe diagonals can be obtained by draw- ing lines through the angles from the points of distance , as the line through e and i , from the point of distance D , or through g ...
Página 81
... diagonals of the bafe : they are marked d 1 , d 2 . Upon the line o , o 2 , set up the height of the plinth from o to ... diagonal lines d 1 , d 2 , in the points a , b , c , and d , e , f , and alfo at g , h , i ; which points are the ...
... diagonals of the bafe : they are marked d 1 , d 2 . Upon the line o , o 2 , set up the height of the plinth from o to ... diagonal lines d 1 , d 2 , in the points a , b , c , and d , e , f , and alfo at g , h , i ; which points are the ...
Página 82
... diagonal d 2 , draw lines perpen- dicular to the horizon ; and the interfections of thofe lines with the former will ... diagonals of the top in the points a , b , c . At the angle o 2 , Fig . 1 , fet downwards upon the line o 2 , 0 ...
... diagonal d 2 , draw lines perpen- dicular to the horizon ; and the interfections of thofe lines with the former will ... diagonals of the top in the points a , b , c . At the angle o 2 , Fig . 1 , fet downwards upon the line o 2 , 0 ...
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Términos y frases comunes
abacus alfo alſo arch artiſt bafe line baſe line becauſe block Brook Taylor building cafe compaffes confequently confidered conftruction cornice defcribe demonftrate determine diagonal difpofed dimenfions draw a line draw a right draw right lines draw the line equal example exprefs fame procefs fcale fcience feat fecond feen feet fhadow fhould fides figure firft firſt fituation foffits follows fome foregoing fpectator fquare front fuch fufficient fuppofed geometrical given ground line height horizontal line inches inclined inftructions interfect the line line a b line drawn line G lines parallel lines perpendicular marked meaſure mitre lines moſt mouldings muft muſt neareſt angle neceffary obferved objects parallelogram pedeſtal pediment Perſpective picture piers plane Plate plinth point of diſtance produce purpoſe reprefentation reprefented ſcale SECT Section ſpace ſquare ſtanding ſtep ſtudent theſe thickneſs thofe lines thofe points upper uſeful vanishing line vanishing point vertical line whofe width
Pasajes populares
Página 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another : 16.
Página 3 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference. XVIII. A semicircle is the figure contained by a diameter and the part of the circumference cut off by the diameter. XIX. "A segment of a circle is the figure contained by a straight line, and the circumference it cuts off.
Página 3 - ... OF THE CIRCLE. A circle contains a greater area than any other plane figure bounded by the same length of circumference or outline. A circle is a plane figure contained by one line and is such that all straight lines drawn from a point within the figure to the circumference are equal, and this point is called the center of the circle. A diameter of a circle is a straight line drawn through the center and terminated both ways by the circumference, as AC in Fig.
Página 15 - ... in which they affect the eye of the observer, under varying conditions : in the latter, it enables us to make representations of visible objects that shall affect the eye in the same manner as the objects themselves would, if viewed from a certain fixed point. " Perspective is the art of drawing on a plane the appearances of any figures by the rules of geometry. "In order to understand the principles of this art, we must consider that a picture painted in its utmost degree of perfection, ought...
Página 1 - A straight line, or right line, is that which lies evenly between its extreme points ; or, as defined by Archimedes, it is the shortest distance between two AB points, as A B.
Página ix - ... to thofe who are not acquainted with Geometry ; but to fuch as have received a .mathematical education, and comprehend the eleventh book of Euclid, Dr. Brook Taylor's treatifes are fufficient for the theory, and fuch perfons will require but little afliftance in the practice.
Página ix - Perfpective, but alfo prevent much error in the future works of thofe artifts who have not opportunity to enter deeply into the fcience. The author cannot conclude this preface without obferving, that in the courfe of the work he certainly would have endeavoured to give more copious...
Página 182 - ... a right angle. XXVIII. An obtufe angled triangle, is that which has an obtufe angle. XXIX. An acute angled triangle, is that which has three acute angles. XXX. Of four fided figures, a fquare is that which has all its fides equal, and all its angles right angles.
Página 17 - ... nature belonging to them. But in this book I make no difference between the plane of the horizon, and any other plane...
Página viii - This citcumftance has never before been attended to by writers on thefubject; and therefore it may be hoped, that this will operate as an improvement, and greatly facilitate the...