 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...  A Course in Mechanical Drawing - Page 41by John Simpson Reid - 1898 - 128 pagesFull view - About this book
 | William Whewell - Conic sections - 1846 - 72 pages
...which we here consider are the Parabola, the Ellipse, and the Hyperbola. THE PARABOLA. DBF. 1. The Parabola is a curve such that every point in the curve is at the same distance from a given point, (called the Focus,) and a given straight line, (called the... | |
 | W.E. WORTHEN - 1857 - 600 pages
...The parabola may be defined as an ellipse whose transverse axis is infinite ; its characteristic is that every point in the curve is equally distant from the directrix EN and the focus F (fig. 165). PROB. LXIL— To construct a parabola ivhen the focus and directrix... | |
 | William Ezra Worthen - Architectural drawing - 1857 - 650 pages
...The parabola may be defined as an ellipse whose transverse axis is infinite ; its characteristic is that every point in the curve is equally distant from the directrix EN and the focus F (fig. 165). PKOB. LXIL — To construct a parabola when the focus and directrix... | |
 | Daniel Kinnear Clark - Engineering - 1878 - 1064 pages
...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... | |
 | Daniel Kinnear Clark - Engineering - 1884 - 1024 pages
...N. The lines TM, TN are tangents. PROBLEMS ON THE PARABOLA. A parabola, DA c, Fig. 64, is a c.irve such that every point in the curve is equally distant from the dir:itrix K. L and the focus F. The focus lies in the axis AB drawn from the vertex or head of the... | |
 | Daniel Kinnear Clark - Engineering - 1889 - 1020 pages
...curve at M, N. The lines T M. TN are tangents. PROBLEMS ON THE PARABOLA. A parabola, DAC, 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... | |
 | William Ezra Worthen - Architectural drawing - 1892 - 848 pages
...parabola may be defined as an ellipse whose transverse axis is infinite •, its characteristic is that every point in the curve is equally distant from the directrix EN, and the/ocws F (Fig. 82). 27 M Method (Fig. 82). — Through the focus F draw the axis AB perpendicul&rto... | |
 | William Kent - Engineering - 1902 - 1204 pages
...is symmetrical with respect to the axes. Via. 54. " 46. The Parabola.— A parabola (DAC, Fig. 56) 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... | |
 | John Simpson Reid - Mechanical drawing - 1919 - 254 pages
...63. Given the directrix BD and the Jocus C, draw a parabola and a tangent to it at the point 3. The parabola is a curve such that every point in the curve...The vertix E is equally distant from the directrix BD and the focus C, that is CE, is equal to EB. Any line parallel to the axis is a diameter. A straight... | |
 | Cyril Sylvester, Thomas Edward Ritchie - Electric lighting - 1927 - 444 pages
...parabola DAC (Fig. 146) is the contour of t the ideal motor-car headlight. The contour is JIIG 146 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... | |
| |
