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ON

PRACTICAL SOLID

OR

DESCRIPTIVE GEOMETRY

CONTAINING

PROBLEMS WITH HELP FOR SOLUTIONS.

BY

J. H. EDGAR, M.A.,

LECTURER ON MECHANICAL DRAWING AT THE ROYAL SCHOOL OF MINES, LONDON ;
AND FORMERLY LECTURER ON GEOMETRICAL DRAWING, KING'S COLLEGE, LONDON ;

LATE LIEUTENANT R.A.

AND

G. S. PRITCHARD,

LATE MASTER FOR DESCRIPTIVE GEOMETRY, ROYAI. MILITARY ACADEMY, WOOLWICH.

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PREFACE.

IN teaching a large class, if the method of lecturing and demonstrating from the black-board only is pursued, the more intelligent students have generally to be kept back, from the necessity of frequent repetition, for the sake of the less promising ; if the plan of setting problems to each pupil is adopted, the teacher finds a difficulty in giving to each sufficient attention. A judicious combination of both methods is doubtless the best, though this is not always easy of attainment in working with numbers —the use of this book may help in accomplishing it.

It is suggested that at the beginning of a chapter, and in some cases with each problem, the teacher should give a black-board explanation, carefully pointing out any fresh steps, before sending his pupils to their work. The number of examples in each chapter to be worked out by the student is, of course, left to the teacher's judgment of the progress and requirements of his pupil.

The student will here be assisted, it is believed, because he will find help given when necessary, and thus will often be able to go on with his work by himself, with the satisfaction also of feeling that he is progressing systematically. Moreover he will be

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