Imágenes de páginas
PDF
EPUB

PRACTICAL PLANE AND SOLID

GEOMETRY,

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][graphic][subsumed][merged small][merged small][merged small]
[merged small][ocr errors][merged small]

PREFACE.

GEOMETRY is one of the most attractive studies to artizans, on account of its practical utility. But attention has been heretofore confined principally to one branch of the subject-Plane Geometry. It is only of late years that Solid Geometry has been brought so extensively into notice in England.

The Science and Art Department has from year to year more strongly advocated the study of the latter branch of the subject, by rejecting greater numbers of those candidates, at their examinations of science classes, who have failed to come up to the gradually increasing standard of excellence in knowledge of its principles.

Foreign nations have been before us in this matter; and the recent Educational Exhibitions have shown that a knowledge of Solid Geometry is considered indispensable to the well-educated foreigner.

There are few English works upon this subject; and those which do exist are either too learned for the ordinary reader, or they are exceedingly expensive. This little treatise has been prepared expressly for those who are studying Geometry in classes in connection with the Science and Art Department. The aim of the writer, who has taught the subject to large classes of artizans for several years, has been to show, as far as possible, the principles upon which constructions are based, thereby helping the student to avoid the system of " 'cram," of which examiners so justly complain.

« AnteriorContinuar »