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 ____
4. Fermi-Dirac ____
6. Foster-Seeley ____
8. Kennelly-Heaviside ____
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
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
55-I. Fletcher-Munson curves show the relationship
between the signal frequency and the sound intensity required
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
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,
and degree of ionization determine their effect upon high-frequency
9-H. The Langmuir-Child Law, or Three-Halves
Power Law, describes the relationship between the applied voltage
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
Posted March 19, 2015