1928, Third Edition, Second Impression; McGraw-Hill Book Company publishers; hardbound; good condition; original owner name and note inside front (pencil); minor tanning of pages.
 
from Preface:
This edition has been made necessary because of the recent improvements in vacuum tubes for use with alternating currents, "A" and "B" battery eliminators, copper-oxide rectifiers, loud speakers, and short-wave receivers.  Researches in the subjects of "fading" and high-power transmission for radio broadcasting have also contributed to the subject matter which should be covered in a practical book on radio...