January 1965 Electronics World
Wax nostalgic about and learn from the history of early electronics. See articles
Electronics World, published May 1959
- December 1971. All copyrights hereby acknowledged.
Robert P. Balin created many electronics-related quizzes for Popular Electronics. I have posted many of them here on RF Cafe, and will post more in the future. Most of the Popular Electronics quizzes were pretty easy for anyone who has been in the electronics realm for a few years. This quiz, by contrast, is a real head scratcher. I was only able to get two out of 10 answers correct. It would take someone who is a physics historian to even come close to acing it - or I'm really just lacking in knowledge. Good luck.
By Robert P. Balin
Many important discoveries and inventions in the field of electronics were made by men who worked together as a team, and current textbooks still include the names of the co-inventors (1-10) listed below, See how many of these teams you can match with the sketches (A-J) which illustrate the devices or theory which they helped to develop.
(See answers below)
2. Biot-Savart ____
3. Eccles-Jordan ____
4. Fermi-Dirac ____
5. Fletcher-Munson ____
6. Foster-Seeley ____
7. Geiger-Muller ____
8. Kennelly-Heaviside ____
9. Langmuir-Child ____
10. Loftin-White ____
1-D. The Barkhausen-Kurz oscillator circuit is a positive-grid u.h.f. oscillator by Lecher wires in the grid and plate circuits.
2-E. The Biot-Savart Law, or Ampere's Law, specifies the direction and magnitude of the magnetic field at any point in
the vicinity of a current-carrying conduelor.
3-J. The Eccles-Jordan trigger circuit, or flip-flop, is a bistable multivibrator in which the conducting state of each half is
changed only by the incoming pulses.
4-B. Fermi-Dirac statistics predict the availability of current carriers in the semiconductor materials used to make transistors.
55-I. Fletcher-Munson curves show the relationship between the signal frequency and the sound intensity required by a
listener to hear a constant loudness.
6-G. The Foster-Seeley FM discriminator circuit converts a frequency-modulated radio-frequency carrier into an
amplitude-modulated signal from which the audio is detected by a balanced diode circuit.
7-F. A Geiger-Muller tube detects nuclear radiation when beta particles ionize the gas inside the tube to start a discharge
of electrons between the cathode case and highly positive anode.
8-C. The Kennelly-Heaviside layer is the original term for the ionosphere, now known to consist of various layers, whose
height and degree of ionization determine their effect upon high-frequency radio transmission.
9-H. The Langmuir-Child Law, or Three-Halves Power Law, describes the relationship between the applied voltage and
the resulting current in a diode vacuum tube.
10-A. The Loftin-White amplifier circuit uses direct coupling between stages and can handle signal frequencies down to d.c.
Posted March 19, 2015