In the 70s I was an avid SciAm reader. I loved the monthly "Amateur Scientist" column, "conducted" by C. L. Stong. Lots of detailed technical info about how to make a seismometer, a nitrogen laser, an electron microscope, antibubbles, etc. etc. etc.

I have the Amateur Scientist 3.0 CD-ROM, including columns from 1928 to 2001, and I just pulled out an October 1974 column, "Electrostatic Motors Are Powered By Electric Field of the Earth". I remember reading it at the time and noticing that one motor diagram had a commutator drawn so that it shorted the supply for half of the rotation. I wrote a (probably precocious and annoying) letter to C. L. Stong alerting him of the problem, signing it as "Dan Griscom, Age 12". Mr. Stong wrote back, confirming that I was right, and signing it as "C. L. Stong, Age 72". (Still have the letter...)

And yes: the magazine has gone downhill.