"bert" wrote in message
...
The term cycles per second was largely replaced by hertz by the 1970s. One
hobby magazine, Electronics Illustrated, declared their intention to stick
with the traditional kc., Mc., etc. units.[8]

They would! I think it was EI that also had a house style of putting dots
between initials and always using lower-case except for metric prefixes, so

kc.p.s.rather than kcps or kc/s (or kHz)
Mc.p.s. rather than Mcps or Mc/s (or MHz)
i.c. rather than IC (integrated circuit)
p.c. rather than PC (personal computer)
e.p.r.o.m. rather than EPROM

which made it harder to read because the eye is attuned to trying to
pronounce "words" of lower-case letters, whereas it is attuned to treating
multiple capital letters as individual letters unless they can easily be
pronounced.