An elementary treatise on geometrical drawing

ABCD angular point applying Euc Bisect the angle bisectors circle required comparative scale decimetres denoted describe a circle describe a semicircle describe a square describe an arc diagonal scale diameter distances Draw a straight Draw GH parallel draw straight lines ellipse equal circles equal in area equilateral triangle furlongs GEOMETRICAL DRAWING given angle given circle given point given square given straight line given triangle inches long Inscribe a regular isosceles triangle Join AP KLMN Let ABC Let this cut major axis mean proportional metres number of equal octagon parallel to BC perpendicular plain scale Proof Proof.-Apply Euc Proof.-Euc protractor radii read miles regular pentagon regular polygon Representative Fraction right angles scale to read segment semi-minor axis sides similar triangle square required straight line drawn subdivide take any point tangent three equal touch trapezium triangle ABC versts vertical angle yards