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THE METHODS OF GLASS BLOWING
AND OF
WORKING SILICA

BY THE SAME AUTHOR _With 25 Illustrations. Crown 8vo, 2s._

=A Practical Introduction to Chemistry.= Intended to
give a _practical_ acquaintance with the Elementary Facts
and Principles of Chemistry.

LONGMANS, GREEN, AND CO.
LONDON, NEW YORK, BOMBAY, CALCUTTA, AND MADRAS.

The Methods of Glass Blowing
AND OF
Working Silica in the Oxy-Gas Flame

_FOR THE USE OF CHEMICAL AND
PHYSICAL STUDENTS_

BY

W. A. SHENSTONE, F.R.S.

FORMERLY LECTURER ON CHEMISTRY IN CLIFTON COLLEGE

_NINTH IMPRESSION_

LONGMANS, GREEN, AND CO.
39 PATERNOSTER ROW, LONDON
FOURTH AVENUE & 30TH STREET, NEW YORK
BOMBAY, CALCUTTA, AND MADRAS

1916

PREFACE

This book consists of a reprint of the third edition of my Methods of
Glass-blowing, together with a new chapter in which I have described the
comparatively new art of working vitreous silica.

The individual operations of glass-blowing are much less difficult than
is usually supposed, and considerable success in the performance of most
of them may be attained by any one who is endowed with average powers of
manipulation and who is moderately persistent. Constructing finished
apparatus is often more difficult, as it may involve the performance of
several operations under disadvantageous conditions, and may demand a
little ingenuity on the part of the operator. But I think the
suggestions in Chapter IV. will make this comparatively easy also to
those who have mastered the operations described in Chapter III.

The working of vitreous silica, though more tedious and expensive than
glass-blowing, is not really more difficult, and as it seems certain
that this new material will soon play a useful part in chemical and
physical research, I believe the addition now made to the earlier book
will add considerably to its value.

As glass is much less expensive to work with than silica, the