Radio Broadcast (Nov. 1925-Apr 1926)

252 RADIO BROADCAST ADVERTISER RADIO BROADCAST Offers You A PERSONAL GRID SERVICE If you are a subscriber to Radio Broadcast the GRID SERVICE is FREE. If you are not a subscriber the GRID SERVICE FEE is one dollar. The dollar, however, can be applied toward a subscription to the magazine. What The Grid Service Is By GRID SERVICE we mean technical information on your particular problem answered by the Technical Editor. He is the Doctor for your sick radio set. De' scribe the symptoms to him in a letter and enclose one dollar, or better still, a year's subscription, which is four dollars, and then you can call on the Doctor all year 'round and get free consultation and read Radio Broadcast for twelve months. GRID INQUIRY BLANK Editor, The Grid, Radio Broadcast, Garden City, J^ew Yor\. Dear Sir: Attached please find a sheet containing questions upon which \indly give me fullest possible information. I enclose a stamped return envelope. (Checl{ the proper square) □ I am a subscriber to Radio Broadcast. Information is to be supplied to me free of charge. O I am not a subscriber. I enclose $1 to cover costs of a letter answering yny questions. □ I would li\e to become a subscriber and enclose $4.00. My name is My address is Gda. Radio Broadcast's NEW BOOK Written by Walter Van B. Roberts W. VAN B. ROBERTS Originator of the famous Roberts Circuit EVERYONE will be delighted with the news we have to unfold. Mr. Walter Van B. Roberts, whose circuit has been used by so many enthusiastic constructors, has compiled a book entitled "How Radio Receivers Work." In this book he has covered the entire field of radio in a most interesting, intelligent, and capable manner. He understands his subject well enough to cut the corners without leaving the reader to take any of the facts for granted merely because they are given as facts. He has proof for everything, and very interesting proof at that. The titles of the chapters will give you an idea of the material contained between the cloth covers of this book, so we list some of theme herewith: "One Syllable Electrical Theory," which includes information on what electrons are and what they do; and the use of condensers and transformers. "What Antenna Is Best," both for receiving and sending, and information as to the best time to tunein for good reception. "Common Vacuum Tube Circuits," with descriptions of the vacuum tube as a detector, oscillator, and amplifier, the method of feed-back and push-pull amplification and the requirements for a tube oscillator circuit. "Essential Accessories," which include loud speakers, batteries and tubes. There are other chapters of like interest. It is difficult to find an author who really knows all these subjects thoroughly and who is gifted with the happy faculty of telling what he knows in language which may be understood by other than scientific minds. Mr. Roberts is such an author, and we are pleased to broadcast the announcement that this 53-page book is now ready for distribution at the nominal price of $1.00. A dollar and the accompanying coupon will make you the possessor of Walter Van B. Roberts" book— "HOW RADIO RECEIVERS WORK." POUBLEDAY, PAGE & CO. Garden City, New York Enclosed find my dollar for Radio Broadcast's new boov by Walter Van B. Roberts, "How Radio Receivers Work." It is understood that my dollar will be returned if the material sent me does not come up to my expectations. Name Address