We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
King Electron Tells About Detection
499
KIXG ELECTRON TELLS HIS BOYS TO WATCH THEIR STEP
Down from the antenna they come, urged on by a radio wave coming through space. At A they come to the variable condenser where they crowd on one side. Off their mates rush from the other side of the condenser. At B these divide, some rushing down through the tuner ;oil to the ground at C; the others take the right-hand path to the steel wire "cat whisker" at D. These continue en ih.cugh the one-way crystal detector at E which acting as a turnstile, will let them through. On they go to F where they pile up on the by-pass condenser. They begin to go through the slower acting
telephone receiver at G and around to the ground at C.
producing sound waves. Where the telephone receiver is used for radio the detector -comes between it and the fast-moving electrons in the tuned aerial circuit.
If a one-way turnstile could be set up so that electrons could pass only in one direction through it, the perfect detector would be found. Such a turnstile would be placed in a wire leading frcrn one side of the tuning coil in the receiving set. From this turnstile a wire path would lead on to the telephone receiver, and from there to ground. Whenever there was a rush of electrons down from the aerial, some would take this path through the turnstile and rush down through the telephone receiver. With the return swing of the electrons, back into the aerial, none of them could get back through the telephone receiver because the turnstile would be set against them. With the million vibrations per second, there would be a million rushes of the electrons in one direction through the turnstile and through the telephone receiver. If the ether waves were steady in value, this would mean that all of the little impulses through the telephone receiver would have the same value. The telephone receiver iron diaphragm is too slow moving to respond to each of the million impulses, but it will take
up an average position pulled by the impulses in one direction in the coils.
As long as the waves keep up their steady vibration, the telephone diaphragm will hold this position, but if the radio waves change in strength, the strength of the little impulses rushing in one direction through the receiver will change also, and the receiver diaphragm will move to correspond. As the changes in the intensity of the radio waves are caused at the transmitting station by sound vibrations, the changes will be passed along into the receiver diaphragm and corresponding sound will be given out by the telephone receiver, and the complete process of broadcasting will be realized.
THE USE OF A CRYSTAL DETECTOR
NO PERFECT turnstile for electrons has been invented yet, but there are many partial solutions. The Crystal Detector is the simplest. This consists of two dissimilar substances which have different electric characteristics at their surfaces. When they are placed in contact with each other this difference makes it easier for electrons to go through the combination in one direction than it is for them to go through in the other direction.