Radio-telephony for Everyone: The Wireless: how to Construct and Maintain Modern Transmitting and Receiving Apparatus

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Frederick A. Stokes Company, 1922 - Radio - 212 pages

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Page 190 - INTERNATIONAL MORSE CODE AND CONVENTIONAL SIGNALS. [To be used for all general public service radio communication. (1) A dash is equal to three dots; (2) the space between parts of the same letter is equal to one dot; (3) the space between two letters is equal to three dots; (4) the space between two words is equal to five dots.) A . _ I ' _ * • • C . D E F G II • • • I . J K L . M N _.
Page 11 - When an electric current passes through a wire, a magnetic field is set up around the wire.
Page 24 - Instantly the wave has become a lightwave and is visible to our eyes, but the heat is still felt. This shows that the ranges of heat and light overlap in the frequency scale. Any further increase of frequency would mean destruction to the reed through overheating ; but if we could imagine its frequency as increasing without burning up, the waves sent out would pass through the ranges of color, and the X-rays.
Page 24 - In one case we hear the sound with a recording organ called the ear, and in. the other case we feel the presence of heat by our sense of touch. As the frequency of the little reed is increased beyond this point, the heat developed finally increases until the reed begins to glow a dull red color. Instantly the wave has become a lightwave and is visible to our eyes, but the heat is still felt.
Page 76 - ... map. The point where the two lines cross is the location of the transmitter in question.
Page 22 - If we cause the reed to vibrate, it will first take the position A, and then swing back and past its original position to a third position B, and then back to its original position again, in much the same way that a pendulum swings.
Page 26 - We know that a fire built in the woods is hot on all sides and Will warm people standing on one side of it just as much as it will warm those on the other side. If we move closer to the fire, the heat increases because the heat-waves are stronger there; if we move away, the heat decreases.
Page 195 - A. ..Canada (British). .Australian Federation (British). ..New Zealand (British). .South African Union (British). . .Newfoundland (British). ..British colonies not autonomous. ..British India. . .Colonies and protectorates of Great Britain. ..United States.
Page 26 - The antenna is shown, for simplicity, as a single wire vertical antenna with a spark-gap as a generator of oscillations, in series with the ground. For every given frequency of current jumping the gap, a wave of a certain definite length is radiated from the antenna. The...
Page 23 - One method of producing sound waves is to cause a slender reed to vibrate back and forth. will increase in pitch until it will be a shrill whistle like the high notes of an organ. If we continuously increase the frequency of the oscillations, when we reach 2,500 cycles per second the sound will have gotten so high that the human ear cannot hear it.

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