April 1959 Popular Electronics
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular
Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from
Here is a rather unique type of crossword puzzle that uses numbers
rather than words. It appeared in the April 1959 edition of
Popular Electronics. The software that I use to create the RF
Cafe crossword puzzles each week has the ability to create such
a puzzle, but I have never made one because it would take a
lot of time to build a clue / answer file to be drawn upon for
input. Maybe some day I'll do it, though.
by John A. Comstock
1 Year Fleming invented diode vacuum
3 This quantity multipled by r.m.s. value
of a.c. voltage will give peak voltage.
6 Slow record player speed.
frequency in kilocycles produced by mixing 1000·kc. signal with
9 Quantity by which peak value
of a.c. voltage is multiplied to obtain r.m.s, value.
12 One-half kilowatt expressed in watts.
Output frequency in kc. of transmitter having crystal frequency
of 2017.5 kc. and two doubler stages.
14 Lower limit
of u.h.f. frequency band expressed in megacycles.
Large-size hi-fi woofer.
17 Very slow record speed.
18 Year tetrode (screen-grid) vacuum tube was
developed. in reverse.
20 Mid frequency in megacycles
of TV Channel 6 when lower frequency limit equals 76 mc.
21 Total resistance of two 44-ohm resistors connected in
22 Upper frequency limit in mc .. of super-high-frequency
24 Voltage drop across 20-ohm resistor when
current flow is 10 amperes.
25 Number of feet in 12
yards of hookup wire.
26 Mid frequency of TV Channel
2 when upper channel frequency limit is 60 mc.
filament voltage rating of 6-volt vacuum tubes.
30 Heater voltage of 35Z5 vacuum tube.
31 Separation in megacycles between TV sound and
video carrier frequencies.
32 Number of zeros represented
by letter K in stating resistor values.
33 Cycles in
34 Total voltage drop in series
circuit when applied voltage equals 50 volts.
1 Degrees of phase shift in voltage fed back
degeneration in amplifier circuit.
2 TV aspect ratio; ratio of picture width to height.
4 Year Lee de Forest invented triode.
5 Voltage drop across 90-ohm resistor when current flow equals
7 Tape recorder slow speed in ips.
10 Wavelength in meters of 400-kc. signal.
record player speed in rpm (approx.).
14 Electrical degrees
in one cycle of alternating signal.
16 In resistor
color code, number represented by green,white and yellow.
17 Year pentode was developed.
degrees in one alternation of sinewave signal.
reactance of 1.0 ufd. capacitor at frequency of 60 cps.
24 Express 0.00271 henrys in microhenries.
650,000 watts to kilowatts.
29 Amount of capacitance
in farads that will store 100 coulombs of electricity when applied
voltage equals 1.0 volt.
30 This number means "the end."
31 Grade of solder often used in electronics work.
Posted December 27, 2013