A course of practical geometry for mechanicsSimpkin and Marshall, 1843 - 68 páginas |
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Página 18
... , into two , three , or four equal parts , so that the eye may become accustomed to judge of equal distances ; for although Problems are provided for such cases , yet instances often occur in which divisions 18 PRACTICAL GEOMETRY .
... , into two , three , or four equal parts , so that the eye may become accustomed to judge of equal distances ; for although Problems are provided for such cases , yet instances often occur in which divisions 18 PRACTICAL GEOMETRY .
Página 19
William Pease. such cases , yet instances often occur in which divisions suf- ficiently accurate can be made by this method , ( with the Di- viders , ) and in much less time than by any other process . A Problem in Practical Geometry ...
William Pease. such cases , yet instances often occur in which divisions suf- ficiently accurate can be made by this method , ( with the Di- viders , ) and in much less time than by any other process . A Problem in Practical Geometry ...
Página 36
... divisions , in the O , when the arch will be completed . The centre stone K , is called by architects the Key stone of the arch . EXAMPLE . Draw a circular arch , ( having 9 voussures of half an inch deep , ) its span 3 inches , and its ...
... divisions , in the O , when the arch will be completed . The centre stone K , is called by architects the Key stone of the arch . EXAMPLE . Draw a circular arch , ( having 9 voussures of half an inch deep , ) its span 3 inches , and its ...
Página 38
... division of an arc is required . For example , suppose 15 degrees were required to be cut off any arc : find the centre by Prob . XXI .: cut off 60 degrees from the arc , ( produced if necessary ; ) and by two operations of Prob . IX ...
... division of an arc is required . For example , suppose 15 degrees were required to be cut off any arc : find the centre by Prob . XXI .: cut off 60 degrees from the arc , ( produced if necessary ; ) and by two operations of Prob . IX ...
Página 49
... division draw lines , each parallel to A D , and cutting DC . 4. Divide A D into any number of equal parts , ( say four , ) and from these points of division , draw lines , each parallel to A B , and cutting BC ; when A B C D shall be ...
... division draw lines , each parallel to A D , and cutting DC . 4. Divide A D into any number of equal parts , ( say four , ) and from these points of division , draw lines , each parallel to A B , and cutting BC ; when A B C D shall be ...
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Términos y frases comunes
60 degrees altitude angle equal arc or angle Bisect called centre chords shall form circumference curvilineal cutting A B decagon describe a circle describe a regular describe an arc describe arcs cutting diagonals diameter dodecagon Draw a line Draw chords draw lines Draw the line ellipse equilateral triangle Euclid Euclid's Elements EXAMPLE generatrix geometry given angle given circle given line given point given right line given triangle gonals heptagon inches long inscribe isosceles triangle Join length Let A B line 2 inches line A B line parallel LVIII number of degrees number of equal parallel ruler parallelogram pentagon perpendicular plane point of intersection protractor radii radius ratio rectangle regular nonagon regular polygon rhombus right angles right-angled triangle segment square equal straight line superficies tangent trapezium triangle being given triangle equal triangle required vertex vertical angle Vide Def vide Prob
Pasajes populares
Página 8 - A plane rectilineal angle is the inclination of two straight lines to one another, -which meet together, but are not in the same straight line.
Página 10 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 9 - CHG; and they are adjacent angles; but when a straight line standing on another straight line makes the adjacent angles equal to one another...
Página 9 - 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.
Página 13 - Of four-sided figures, a SQUARE is that which has all its sides equal, and all its angles right angles.
Página 9 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it.
Página 14 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.
Página 8 - A plane angle is the inclination of two lines to one another* in a plane, which meet together, but are not in the same direction.
Página 13 - A rhomboid, is that which has its opposite sides equal to one another, but all its sides are not equal, nor its angles right angles.
Página 8 - DBC, or CBD ; but, if there be only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.