A Course in Mechanical Drawing (Google eBook)

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Wiley, 1898 - Drawing instruments - 138 pages
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Page 27 - AC should be, for this plate, 1^" long. Produce AC to B. From C as center, with a radius equal to CA, describe the semicircle A 128456 7 B, and divide it into as many equal parts as there are sides in the required polygon (in this case eight).
Page 26 - EFC, cutting the circle at F. 2. Divide EF into four equal parts, and set three parts from F, to C. 3. Divide the diameter AB into as many equal parts as the polygon is required to have sides. 4. From C, through the second division in the diameter, draw CD.
Page 41 - KL and the focus F. The focus lies in the axis AB drawn from the vertex or head of the curve A, so as to divide the figure into two equal parts. The vertex A is equidistant from the directrix and the focus, or A e A F.
Page 41 - L F', cutting the curve at M, N. The lines TM, TN are tangents. PROBI^fS OX THE PARABOLA. A parabola, DA c, Fig. 64, is a curve such that every point in the curve is equally distant from the directrix KL and the focus F. The focus lies in the axis AB drawn from the vertex or head of the curve A, so as to divide the figure into two equal parts. The vertex A is equidistant from the directrix and the focus, or \e=AF.
Page 41 - AB, cutting EF at E and F. Divide BC and BD, each into any number of equal parts, as four ; likewise divide CE and DF into the same number of equal parts.
Page 76 - If a line be perpendicular to one of the planes of -projection, its projection on that plane is a point ; for, the projecting lines of all the points coincide with the given line.
Page 34 - A as centre, and radius equal to the difference of the radii of the given circles. Describe a circle...
Page 128 - Working drawings are sometimes made on brown detail. paper in pencil, traced on tracing-paper or cloth, and then blue printed. The latter process is accomplished as follows: The tracing is placed face down on the glass in the printing-frame, and the prepared paper is placed behind it, with the sensitized surface in contact with the back of the tracing. In printing from a negative the sensitized surface of the prepared paper is placed in contact with the film side of the negative, and the face is...
Page 124 - And if the line 3, 2 be divided into any number of equal parts, and lines be drawn through these divisions par.
Page 31 - Draw a diameter, A B. Draw line AC perpendicular to line AB, and equal to three times the radius of the circle. Draw a line at B perpendicular to A B. With the radius of the circle cut off arc B D. Bisect arc B D. Draw a line from the centre of the circle through the bisection, cutting line B in E. Join E C.

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