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Example Draw the line A B at pleasure. mark the extreme point of A. B. from the point set off by eye the perpendicular line to C. equal in length to the base line A.B. . repeat the same reversed Fig. 1 [[2 images]] as before draw the base line A. B at will. mark the extremities of the line by a dot of the pencil, next draw the line perpendicular to C of equal length with the base line [[1 image]] Mark by a dot the perpendicular point above B. as given at D. draw The second horizontal line to it and parallel with A.B. and of equal length to the point D.. draw the line D.to.B. and the square is completed half and quarter it as given by the dotted line. in time may serve to exercise the scholar. at the option of the teacher, the practice is a good exercise [[strikethrough]] for the [[/strikethrough]] the eye to conect estimate of distances, [[strikethrough]] which it [[?]] [[/strikethrough]] & it cannot well be too often repeated. Draw the Base . line A.B. at will . marking its terminations. . Erect the perpendicular of equal length. to C, draw the line C. to D. Complete this figure repeat it reversed [[2 images]]