NIKOLA TESLA: LECTURE BEFORE THE NEW YORK ACADEMY OF SCIENCES - April 6, 1897 Leland I Anderson, Editor TWENTY FIRST CENTURY BOOKS BRECKENRIDGE, COLORADO ỈTHE ORCE RF NIKOLA TESLA: THE NEW YORK ACADEMY OF SCIENCES 6, 1897 ỈTHE ORCE RF Nikola Tesla International TelecommWlications Union ỈTHE ORCE RF NIKOLA'TESLA: BEFORE THE NEW YORK ACAD8v1Y OF The Streams oHenard and Roentgen and l\!ovel Apparatus lOr Their Prcxiuction April 1897 Reconstructed Leland Anderson, Editor 1994 TWENTY ARST CENTURY BOOKS BRECKEI\lRJOOE COLORAOO ÆTHE ORCE RF Copyright © Leland Anderson All rights reserved No p'dlt of this book may be reproduced in any fonn or by any means, electronic or mechanical, including photOCOpying, recording, or by any mfOrmatIon storage and retrieval system, without permission in writing from the publisher, of ,, ,ll.;UV:': Card Number: 94-61004 ISBN 0-9636012-1-0(hardcover) 0-9636012-7-X (soft cover) First Century Books P.O Box 2001 Breckenridge, Colorado 80424 ỈTHE ORCE RF Contents Figures vii Editorial viii ix Introduction xiii Setting on non-publication of Lecture Commentary High frequency apparatus Lenard Roentgen 18 actions from Lenard and Roentgen 26 The I - 29 Improved Apparatus for the Production of Powerful Electrical Vibrations; Novel Frequency Measurement Methods Section I Addendum Wireless Telegraphy Receiving Methods 71 Section II The Hurtful 83 ""'''''''''Vll "\.-ClIVlli> of Roentgen 95 III - The Source of and "-'V''''''L)::;''H Appendix Contemporary reviews of lecture Acknowledgments Con- 109 III 117 ỈTHE ORCE RF VI CONTENTS Sponsorship 118 Index 121 ÆTHE ORCE RF vii Figures Form of listing: Sec !f.-Fig If LC node in 14 circuit) I-I Method of transformation of electrical energy by oscillatory condenser discharges 34 1-2 Mechanical 35 illustrated in 1-3 1-4 of electrical oscillator I with self-induction coil increased Coil wound to secure 1-5 37 37 r.,,,,,,r:lfv a secondary coil with a primary circuit coil 38 1-6 System 1-7 Circuit controller allowing condensers connected to discharge circuit and ~ll