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| changed to _whence it might gradually leak into_. |
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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 beginner
will find it best to spend a few days working with the common gas
blow-pipe and glass before he attempts to manipulate the new and more
refractory material. Therefore, in writing the new chapter, I have
assumed that the reader is already more or less familiar with the rest
of the book, and have given only such instructions and advice as will be
required by one who is already able to carry out simple work at the
blow-pipe.
W. A. SHENSTONE.
CLIFTON COLLEGE,
_Dec. 1901_.
CONTENTS
CHAPTER I.
GLASS-BLOWER'S APPARATUS.
PAGE
Introductory--The Working-place--The Blow-pipe--The
Bellows--Automatic Blower--Blow-pipe Flames, 1-11