This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...turns of both windings will overlap providing undesirable electrostatic coupling between them. This may prevent sharp resonance at ...Read MoreThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...turns of both windings will overlap providing undesirable electrostatic coupling between them. This may prevent sharp resonance at some wave lengths Following Fig. 137 in detail: The secondary inductance is varied by a simple multi-point switch. Some amateurs take off taps every 10 or 15 turns. Resonance between taps is established by the shunt secondary condenser C-l. Fia. 137. Fundamental circuit of the inductively coupled receiving set using a crystal rectifier with a local battery. The diagram shows the relative positions of the '"used" turns of the primary and secondary coils. The plan of Fig. 137 appeals to the amateur who does not care to go to the expense of a "tens" and "units" switch for the primary coils. The number of turns in the aerial tuning inductance is varied by a simple plug contact switch, while the primary has a simple multi-point switch. The primary coil is tapped, at about every 10 turns. Resonance to any wave length occurring between the primary taps may be secured either by shunting the primary with a variable condenser, or by placing a variometer in the antenna circuit. Considerable tuning between taps can be effected by change of coupling between the primary and secondary coils alone. If the detector in Fig. 137, is a carborundum rectifier, the battery B should have an e.m.f. of 4 volts. The potentiometer P is one of 400 ohms. Condenser C-2 may be one of fixed capacity--some value between 0.002 and 0.005 mfd. The telephones should be of 3000 ohms resistance. The beginner should study the practical application of the foregoing inductance and wave length formulae and make several calculations of the possible wave lengths with various coils. This will instill in his mind a relative sense of...Read Less
New. pp. 373. Pages 373 It is the reproduction of the original edition published long back (1920 ). Hardcover with sewing binding with glossy laminated multi-Colour Dust Cover, Printed on high quality Paper, professionally processed without changing its contents. We found this book important for the readers who want to know about our old treasure so we brought it back to the shelves. Print on Demand.
New. 363 pages. Reprinted from 1920 edition. New 2013 edition in PAPERBACK is SEWN PERFECT BOUND, much more durable than a standard paperback. This is a quality reprint of an old book of historical value. If the original book was printed in multiple volumes than this reprint is of only a single volume. This is an exact/strict reproduction of text, no changes has been made in respect to the original text. A lot of effort has been made to check and improve each page/scan manually for its quality of text and illustrations (if any, are in b/w). Folded illustrations, if any, are not included in the book. This is not a retyped or an ocr'd book. Index, contents, etc, if any in the original book, are included. This item is printed on demand using good quality natural shade paper. The title of the book, on the cover, is in gold lettering.
New. 373 pages. ReInk Books reprint from the 1920 edition. This paperback book is SEWN perfect bound, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of paperback binding. It can also be open wide. The pages will not fall out and will be around for a lot longer than normal paperbacks. NO changes have been made to the original text. Each page is checked manually before printing. Illustrations, Index, if any, are included in b/w. Fold-outs, if any, are not part of the book. If the original book was printed in multiple volumes than this reprint is of only a single volume. This book is printed on demand on acid-free paper. (Original publisher: ill. )
Copyright in bibliographic data and cover images is held by Nielsen Book Services Limited, Baker & Taylor, Inc., or by their respective licensors, or by the publishers, or by their respective licensors. For personal use only. All rights reserved. All rights in images of books or other publications are reserved by the original copyright holders.