About Tom Swift, Jr. - Boys’ series of 33 well-written, imaginative science adventure books published from 1954 through 1971. These followed the earlier 1910-41 40-volume Tom Swift series, but are NOT revisions/condensations of the earlier series. They are entirely new plots with new characters, but feature some of the family and friends of the earlier series. So the admired and groundbreaking new inventions of the Jr. series are from a much later era, inspired by the space flight advances then in the works, and in the news of the day. #20 in the series. Grosset and Dunlap. Copyright 1962. Rear cover lists to #29 Captive Planetoid (1967). On that basis, a 1967 or 1966 print run is estimated. Very good condition. White/black space lab endpapers. No writing/markings, no tracking. Sturdy hinges. Noticeable corner bump at upper front, but other corners pretty good. In this one, Tom develops a device that uses high-powered radio waves to scan surfaces of items and create electronic images of them on cathode-ray tubes (such as used in mid-century televisions). These radio waves can move faster than the speed of light, and are able to continue indefinitely without losing power. TS20K