## The Elements of Descriptive Geometry ...Parker, 1841 - 100 páginas |

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Página 73

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**radius**equal to half h ' ' ; and it cuts the plane pqp ' in a line perpendicular to the vertical plane , the horizontal projection nn of which per- E pendicular is readily determined . The points n , n DESCRIPTIVE GEOMETRY . 73. Página 75

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**radius**. Let aBy ... be this circle ; make the portion of the circumference a ...... a ' equal to the periphery of the base of the cone , setting off along it small equal chords , which by trial have been found to divide the circular ... Página 86

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**radius**, having a , a ' for its centre , made by the plane of the two axes . The points c'c " , d'd " , are therefore the vertical projections of points common to these meridians and to the sphere . If the meridian of the first surface ... Página 91

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**radius**; the vertical projection of the curve of the section with the second surface will be ff " ; and to obtain points in the horizontal projection , the surface must be supposed cut by planes perpendicular to its axis , forming ... Página 92

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**radius**. Now , the points projected in h ' , before mentioned , are not moved on this supposition ; their horizontal projections , therefore , will be hh , in which the circle kl cuts h'h . By means of other planes perpendicular to b'c ...### Outras edições - Ver tudo

### Palavras e frases frequentes

angle arcs assumed axes axis base called centre circle coincide common cone conic consequently considered construction contains corresponding curve curve of intersection cylinder described Descriptive determined developed dicular distance draw draw the tangent drawn equal evident example faces figure formed generatrixes given line given point ground line helix Hence HISTORY horizontal plane horizontal projection horizontal trace intersection length line joining lines parallel magnitude means meet moving necessary normals obtained obviously Octavo parallel perpen perpendicular plane of projection plane passing plane pqp point of contact polygon position PROBLEM produced PROPOSITION radius required plane respectively right angles sides situated solid sought space sphere straight line supposed surface tangent plane third plane tion true vertex vertical plane vertical projection vertical trace

### Passagens conhecidas

Página 101 - A MANUAL of CHRISTIAN ANTIQUITIES ; or an Account of the Constitution, Ministers, "Worship, Discipline, and Customs of the Early Church ; with an Introduction, containing a Complete and Chronological Analysis of the "Works of the Antenicene Fathers.

Página 11 - If two straight lines meeting one another be parallel to two other straight lines which meet one another, but are not in the same plane with the first two; the plane which passes through these is parallel to the plane passing through the others.

Página 10 - From the same point in a given plane there cannot be two straight lines at right angles to the plane, upon the same side of it : and there can be but one perpendicular to a plane from a point above the plane.

Página 101 - HISTORY of the CHURCH of ENGLAND, to the REVOLUTION in 1688; embracing Copious Histories of the Thirty-Nine Articles, the Translation of the Bible, and the Compilation of the Book of Common Prayer.

Página 6 - IF two straight lines be parallel, the straight line drawn from any point in the one to any point in the other is in the same plane with the parallels.* Let AB, CD be parallel straight lines, and take any point E in the one, and the point F in the other : the straight line which joins E and F is in the same plane with the parallels.

Página 103 - BIBLE CYCLOPEDIA; a Comprehensive Digest of the Civil and Natural History, Geography, Statistics, and General Literary Information connected with the Sacred Writings.

Página 101 - CV. *HISTORY OF THE CHRISTIAN CHURCH ; from the Ascension of Jesus Christ to the Conversion of Constantine. By the late EDWARD BURTON, DD, Regius Professor of Divinity at Oxford.

Página 2 - A solid angle is that which is made by the meeting of more than two plane angles, which are not in the same plane, in one point. X. ' The tenth definition is omitted for reasons given in the notes.

Página 105 - Progressive Exercises in Greek Tragic Senarii, followed by a Selection from the Greek Verses of Shrewsbury School, and prefaced by a short Account of the Iambic Metre and Style of Greek Tragedy.

Página 7 - Two straight lines which are each of them parallel to the same straight line, and not in the same plane with it, are parallel to one another. Let AB...