ELECTRICAL ENGINEERING. 29 



ELECTRICAL ENGINEERING. 



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CENTRAL ELECTRICAL STATIONS: 



Their Design, Organisation, and Management, 

 BY CHAS. H. WORDINGHAM, A.K.C., M.lNST.C.E., M.INST.MECH.E., 



Late Memb. of Council Inst.E.E., and Electrical Engineer to the City of Manchester ; 



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ELECTRIC CRANE CONSTRUCTION. 



BY CLAUDE V. HILL, A.M.IxsT.C.E. 



CONTENTS. Section I. Types of Cranes and General Stresses in their 

 Structures. Overhead Cranes. Locomotive and Portable Jib Cranes. Derrick 

 Cranes. Transporters. Sheer Legs. Revolving Cantilever Cranes. Cableways. 

 Recorder Diagrams of Crane Tests. Calculation of Power for different Motions. 

 Starting Torque and Acceleration. Section II. Design of Crane Structures. 

 Stress Diagrams. Wind Pressure. Rive tting. Design of Struts Braced Columns, Jibs, 

 Towers, Cantilevers, Girders, <fec. Examples. Design of Machinery. Strength. 

 Deflection and Twist of Shafts. Bearings. Roller Bearings. Wheels. Hoisting 

 Barrels. Live Rollers. Coil, Disc, Band and Block Brakes. Electro-Magnetic 

 Brakes. Strength and Efficiency of Toothed and Worm Gear. Worm Gear for 

 Intermittent Work. Hooks. Ropes. Lifting Magnets. Design of Electro-magnets 

 and Solenoid Plunger Magnets. Motors, Rating, Speeds, Temperature Rise on 

 Intermittent Work. Controllers. Calculation of Resistances. Parallel Resistances for 

 Slow Speeds. Collector Gear. Section III. Crane Installations. TABLES. INDEX. 



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ELECTRICITY METERS. 



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TRANSFORMERS. 



BY HERMANN BOHLE, M.I.E.E., 



Prof, of Electrotechnics, S.A. College, Cape Town, 

 AND PROFESSOR DAVID ROBERTSON, B.Sc., A.I.E.E., or BRISTOL. 



CONTENTS. General Principles. Magnetising and No-Load Currents. Losses in 

 Transformers. Iron Losses. Copper Losses. -Temperature Rise. Magnetic Leakage. 

 Leakage Inductance. Vector Diagrams for Transformers. Systematic Testing of Trans- 

 formers. Insulating Materials. Examples of Construction. Design of Transformers. 

 Applications of Transformers. Regulating and Phase-Changing Transformers. INDEX. 



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WIRELESS TELEGRAPHY. 



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