Great FREE Offer to Electrical Engineers and Electrical Workers W INVITEE Y OUT O EXAMINE IN YOUR OWN HOME ,FOR ONE WHOLE WEEK ,ABSOLUTELY FREE O F CHAR GEO ROB L IG A T ION TOP U CHASER THE ELECTRICAL ENCYCLOPEDIA General E d ito r:S. G. Blaxland Stubos Associate Editors :Arthur Arnold, A.M.I.E .E .I.M.,A.M ech .E .,Editor of “The Power Engineer.” .AR. Baynton, B .Sc. (Eng.), A .C.G .I. Philip Kemp M.Sc. (Tech.), M .I.E .E.,M em .A .I.E .E .,Head of the Polytechnic School of Engineering. S. 0 .Pearson, B .Sc.,A.M .I.E .E.S. Austen Stigant, M .I.E .,F.E .Am G..l.E.E W . Stubbings, B .Sc. (Lond.) F.In st.P .A.M.I.E .THE.E FIRST and ONLY BOOK OF ITS KIND An Entirely New Work and on a Novel Plan A Handbook of Modern Electrical Practice for the Working Electrician GIFT BOOK j Valuable 66 -page :Pocket Book of I Reference Tables I Presented FREE |to all purchasers.*............................................. 'H'T I comprehensiveS work contains ¦sound,-* u -top -date, authoritative information written b y experts in every branch of the profession, and covers thou sands o f problem sand questions o f every work.day The rapid development o f electrical tech no logy mean san enormous increase o f opportunities for the electrical engineer who keeps abreast o f advancing know ledge. YOU can seize these new opp o rtu n itie sNOW b they aid o f “The Electrical Encyclopedia .”Whatever your particular sub je c tor job you will find that this work will add to your efficiency, aid your advance in your profession and secure certain SUCCESS .Above is greatly reduced illustration of the Jour volumes. I,480 Pages. 2,000 Articles. Over 2,300 Photographs, Drawings, Diagrams, etc. THE SCOPE OF THE ENCYCLOPEDIA Will be seen in this list o) sections on which, it was built up. A c cum u la tor sand Batteries. App lic a t ions o f Electricity .—Industrial, domestic, medical, scientific, etc., as, for instance, Agriculture, Cinema Plant, Refrigeration, Ultra-Violet Ray apparatus, Welding, etc. Definition s.—An essentia! group with hundreds of items. Gene r a tor sand Motors .A.C .and D.C .—Including large and small machines, from the 32.000 kVA. alternator to the tiny fractional h.p. motor with all accessory machines and apparatus. Heating and Coo king .—Every form of modern apparatus described with maintenance and repair notes. Instrument sand Testing .—Meters of every variety now in use, fault* and fault location in cables, wiring, generators and motors, the best methods oftest, and resting instruments. L a wand Reg u lat ions .—Amply covered and explained. Lamp sand L ig h ting Method sand Fittings.—Modern methods, such La.vas Lighting, Cornice Lighting, Tubular Lighting, Flood-lighting, and new apparatus, as Hot Cathode Lamps, fully dealt with Miscellaneous :Mate rials Sand n e c ia l Departments .—Every classifi-cation has its miscellany. Here are in eluded the materials used in electro technology specialist sections such as electro-chemistry, electro-metallurgy, and other matters. Sup ply and Trans miss ion.— The apparatus, principles, and methods employed between the power station and the consumers' terminals. Switch g e a rand Switch board .—The immense variety of apparatus used for controlling electric, power is covered in principle and detail. Theory of Electrical Practice .—Put clearly and simply without incursion into higher mathematics. Trans former sand Rectifier s.—In eludes every variety of transformer, as well as Metal Rectifiers, Mercury Arc Rectifiers, eto. Wireless or Radio Work. —Dis-*cussions of theoretical principles and their application in modern radio practice. Instruction is given on repair and maintenance. Wiring :Methods ,Mate rials ,and Installation.—Including cables of all kinds, and all the best apparatus and fittings. SEND TO-DAY! Just sign and post the form oeiow, ano on acceptance we will send you these four volumes, carriage paid, to examine for one week free. You may either return them to us, carriage forward, within 8 days, to end the matter, or you may keep them on the very easy terms outlined on the form. If you do not wish to cut this coupon ,send a postcard mentioning" I Was There/ 1 Part 20, to the Wave rle y Book Comp any ,who will be pleased to send you a printed application Inform Its place.“ I WAS THERE ”FREE E X A MIN A T ION FORM To the WAVER LE Y BOOK C O .,LIMITED 96 and 97, Farringdon Street, LON DON, E.C.4. 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