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LARDEN, M.A. AUTHOR OF A SCHOOL COURSE IN HEAT,' IN USE AT RUGBY, CLIFTON, NEW EDITION LONDON LONGMANS, GREEN, AND CO. AND NEW YORK: 15 EAST 16th STREET 1893 All rights reserved PREFACE 10 THE SECOND EDITION. In this edition many misprints have been corrected, several sections have been revised and improved, and some additions made on the subject of modern measuring instruments. In answer to certain criticisms the author would add, firstly, that the book is not intended to be a practical companion to the laboratory, but rather to indicate the amount of theory that it is advisable to master before entering upon technical work; secondly, that it is assumed that the student can see and examine the instruments referred to, the descriptions being intended merely to enable the learner to understand at once the principle of each instrument that comes under his notice. The writer wishes to acknowledge his obligations to Dr. A. H. Fison for help most kindly given with respect to corrections and additions for this edition. August 1888. W. L. |