Light and Shade with Chapters on Charcoal, Pencil, and Brush Drawing: A Manual for Teachers and Students

Εξώφυλλο
Ginn & Company, 1897 - 183 σελίδες
 

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Δημοφιλή αποσπάσματα

Σελίδα 168 - A cylinder of revolution is a cylinder generated by the revolution of a rectangle about one side as an axis.
Σελίδα 175 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Σελίδα 167 - Circumference or periphery of a circle is its entire bounding line ; or it is a curved line, all points of which are equally distant from a point within called the center.
Σελίδα 5 - Greeks found that the angle of incidence is equal to the angle of reflection; and their knowledge reached no further than to such simple deductions from this as their geometry sufficed for.
Σελίδα 174 - Ax1s of a regular pyramid is a straight line connecting the vertex and the center of the base. The ALTITUDE of a pyramid is the perpendicular distance from the vertex to the base.
Σελίδα 177 - An EQUIANGULAR TRIANGLE is one in which the three angles are equal. The value of each angle is 60°. The BASE is the side on which the triangle is supposed to stand. In an isosceles triangle, the equal sides are called the legs, the other side the base; in other triangles any one of the sides may be called the base. The ALTITUDE is the perpendicular distance from the vertex to the base. Except in the isosceles triangle, there are three altitudes. The vertex of the angle opposite the base is often...
Σελίδα 165 - The degree is divided into sixty equal parts called minutes, and the minutes into sixty equal parts called seconds. Degrees, minutes, and seconds are denoted by symbols. Thus 5 degrees, 13 minutes, 12 seconds, is written 5° 13
Σελίδα 175 - RHOMBOID is a parallelogram whose angles are /V oblique angles. * ' A RHOMBUS is a Rhomboid whose sides are equal. / / The side upon which a parallelogram stands and the opposite side are called respectively its lower and upper bases.
Σελίδα 174 - RECTANGLE is a quadrilateral whose angles are right angles. A SQUARE is a rectangle whose sides are equal. A RHOMBOID is a parallelogram whose angles are oblique angles.
Σελίδα 169 - ... regular polygon with an even number of sides a line joining the centres of two opposite sides is often called a diameter. Diverging Lines. Lines extending from a common point. Edge. The intersection of any two surfaces. The boundary line. Edges are straight or curved, and are represented by lines. Elevation. A drawing made on a vertical plane by means of projecting lines perpendicular to the plane from the points of the object. The terms elevation, vertical projection, and front view all have...

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