ONLABORATORY ARTS
BY
RICHARD THRELFALL, M.A.
PROFESSOR OF PHYSICS IN THE UNIVERSITY OF SYDNEY;
MEMBER OF THE INSTITUTE OF ELECTRICALENGINEERS;
ASSOCIATE-MEMBER OF THE INSTITUTE OF CIVILENGINEERS;
MEMBER OF THE PHYSICAL SOCIETY
London
MACMILLAN AND CO., LIMITED
NEWYORK: THE MACMILLAN COMPANY
1898
Allrights reserved
PREFACE *
CHAPTER I *