‘A book we have every confidence in recommending.’—_Daily Chronicle._ By J. HOPKINSON, D.Sc., F.R.S. =DYNAMO MACHINERY, ORIGINAL PAPERS ON.= With 98 Illustrations. 5_s._ ‘Must prove of great value to the student and young engineer.’—_Electrical Review._ By S. R. BOTTONE. =ELECTRICAL INSTRUMENT-MAKING FOR AMATEURS.= A Practical Handbook. With 78 Illustrations. Sixth Edition, Revised and Enlarged. 3_s._ ‘To those about to study electricity and its application this book will form a very useful companion.’—_Mechanical World._ By S. R. BOTTONE. =ELECTRO-MOTORS: How Made and How Used.= A Handbook for Amateurs and Practical Men. With 70 Illustrations. Third Edition, Revised and Enlarged. 3_s._ ‘We are certain that the knowledge gained in constructing machines such as described in this book will be of great value to the worker.’—_Electrical Engineer._ By S. R. BOTTONE. =ELECTRIC BELLS, AND ALL ABOUT THEM.= A Practical Book for Practical Men. With more than 100 Illustrations. Fifth Edition, Revised and Enlarged. 3_s._ ‘Any one desirous of undertaking the practical work of electric bell-fitting will find everything, or nearly everything, he wants to know.’—_Electrician._ By S. R. BOTTONE. =THE DYNAMO: How Made and How Used.= Tenth Edition, with additional matter and Illustrations. 2_s._ 6_d._ =HOW TO MANAGE A DYNAMO.= By the same Author. Second Edition, Revised. Illustrated. Pott 8vo, cloth. Pocket size. 1_s._ ‘This little book will be very useful.’—_Electrical Engineer._ By Sir DAVID SALOMONS, Bart., M.A., Vice-President of the Institution of Electrical Engineers, etc. =ELECTRIC-LIGHT INSTALLATIONS, AND THE MANAGEMENT OF ACCUMULATORS.= A Practical Handbook. Sixth Edition, Revised and Enlarged, with numerous Illustrations. 6_s._ ‘To say that this book is the best of its kind would be a poor compliment, as it is practically the only work on accumulators that has been written.’—_Electrical Review._ By J. GRAY, B.Sc. =ELECTRICAL INFLUENCE MACHINES=: containing a Full Account of their Historical Development, their Modern Forms, and their Practical Construction. 4_s._ 6_d._ ‘This excellent book.’—_Electrical Review._ By EDWIN J. HOUSTON, A.M., Professor of Natural Philosophy and Physical Geography in the Central High School of Philadelphia, Professor of Physics in the Franklin Institute of Pennsylvania, etc. =ADVANCED PRIMERS OF ELECTRICITY.= Vol. I.—ELECTRICITY AND MAGNETISM. 3_s._ 6_d._ Vol. II.—ELECTRICAL TRANSMISSION OF INTELLIGENCE. 5_s._ Vol. III.—ELECTRICAL MEASUREMENTS. 5_s._ =THE METRIC SYSTEM OF WEIGHTS AND MEASURES COMPARED WITH THE IMPERIAL SYSTEM.= By W. H. WAGSTAFF, M.A., Professor of Geometry at Gresham College. Crown 8vo, cloth. 1_s._ 6_d._