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LONDON:
JOHN WEALE, 59, HIGH HOL BORN, W.C.

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PREFACE.

In the Report for January, 1859, on the Military Examinations, Captain Binney, referring to the deficiency in Geometrical Drawing exhibited by the majority of the candidates, assigns as one reason,

“ the absence of any English work treating of the subject of Geometrical Drawing generally in anything like a practical manner.” An attempt has been made in the present volume to supply, to some extent, the desideratum here pointed out.

While the subject of Plane Geometry enters into the course of study adopted by most of our educational establishments, Descriptive Geometry has hitherto not met with that attention which the importance of the subject demands. Apart from its practical application to the arts and sciences, Descriptive Geometry ought to recommend itself to our consideration were it only as a means of mental culture. It will be conceded by those who are conversant with the subject, that, in this respect, its value is little, if any, inferior to that derived from the study of Plane Geometry.

Such being the case, and considering its varied and extensive application, that it should not have been more generally recognized as a branch of elementary education, is remarkable. The explanation of such a state of things may, perhaps, be found in the barrenness of English scientific literature in

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