A course of practical geometry for mechanicsSimpkin and Marshall, 1843 - 68 páginas |
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Página 6
... lines which have “ breadth , ” yet they should be drawn as thin as possible , as most of the re- sults in line drawing depend upon the intersections of lines , in order to obtain points ; if , therefore , the lines themselves are thick ...
... lines which have “ breadth , ” yet they should be drawn as thin as possible , as most of the re- sults in line drawing depend upon the intersections of lines , in order to obtain points ; if , therefore , the lines themselves are thick ...
Página 15
... drawing , is its lowest line , and is usually horizontal ; but in theoretical geometry , a right line in any ... lines cross each other , the opposite angles they make are called Vertical angles ; but if a line be drawn upon , and any ...
... drawing , is its lowest line , and is usually horizontal ; but in theoretical geometry , a right line in any ... lines cross each other , the opposite angles they make are called Vertical angles ; but if a line be drawn upon , and any ...
Página 17
... line of motion , along which a line or plane , called a Describent , may be conceived to move , to describe a plane or solid . The words describe , construct , make , and draw , are fre- quently used in practical geometry , in one and ...
... line of motion , along which a line or plane , called a Describent , may be conceived to move , to describe a plane or solid . The words describe , construct , make , and draw , are fre- quently used in practical geometry , in one and ...
Página 18
... draw , with a hard lead pencil , straight lines , and concentric circles , following the edge of the ruler for one ... line examined to ascertain whether the whole are equal , clear , and of uniform thickness ; for to draw a good line is ...
... draw , with a hard lead pencil , straight lines , and concentric circles , following the edge of the ruler for one ... line examined to ascertain whether the whole are equal , clear , and of uniform thickness ; for to draw a good line is ...
Página 20
... Draw two right lines of any length , and let them contain any angle . Call this the given angle . Print or write ( with the lead pencil ) any letters at the ex- tremities of these lines , ( as BA C , in the diagram annexed , ) simply ...
... Draw two right lines of any length , and let them contain any angle . Call this the given angle . Print or write ( with the lead pencil ) any letters at the ex- tremities of these lines , ( as BA C , in the diagram annexed , ) simply ...
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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.