Every quartz watch on every wrist, every microcontroller heartbeat, every GPS satellite's timekeeping signal — they all descend from a single experiment performed in 1917 by a Scottish-born engineer at Western Electric who was working with, of all things, a piece of crystallized cream of tartar.

Alexander McLean Nicolson built the world's first crystal oscillator using Rochelle salt — potassium sodium tartrate — a piezoelectric crystal that had been discovered way back in 1655 by an apothecary in La Rochelle, France, originally as a laxative. Pierre and Jacques Curie had demonstrated its piezoelectric properties in 1880 (yes, that Pierre Curie, before Marie), but it took Nicolson to realize that if you could make a crystal vibrate by applying voltage, you could use that mechanical resonance to regulate an electronic circuit at an extraordinarily precise frequency.

This is the magic that powers nearly all modern electronics: a tiny sliver of crystal acts as a mechanical tuning fork that's so stable, so resistant to drift, that an oscillator built around it will tick at the same frequency for years. The crystal in your wristwatch vibrates 32,768 times per second — a power of two chosen specifically so a chain of binary dividers can produce a clean one-second pulse.

What's wild is the historical race. Nicolson filed his patent in 1918. Walter Cady at Wesleyan independently built a quartz oscillator in 1921 and is often given credit for the modern version (Rochelle salt is too fragile and moisture-sensitive for serious use). The two ended up in a protracted patent dispute that Nicolson largely won — Bell Labs sued Cady, and the courts upheld Nicolson's priority. Yet Cady's name appears in most textbooks today, partly because quartz proved to be the practical winner.

Nicolson didn't stop at oscillators. He also:

• Invented an early loudspeaker using the same Rochelle salt piezoelectric effect
• Patented a single-sideband radio transmission technique that AT&T used for transatlantic telephony
• Developed early work on television scanning systems
• Held over 200 patents by the time of his death in 1950

And yet outside of obscure engineering history papers, almost nobody knows his name. There's no Nicolson Building at MIT. No "Nicolson frequency" unit. Western Electric absorbed his contributions into Bell Labs' broader legacy, and the popular story of quartz timekeeping skips straight to Seiko's 1969 Astron wristwatch — which used a crystal oscillator that was, in a direct lineage, Nicolson's invention refined across 52 years.

Here's the kicker: the GPS satellites overhead right now contain atomic clocks, but they also contain crystal oscillators that discipline them. The entire $100+ billion global positioning industry rests on a piezoelectric trick first demonstrated with a French laxative ingredient by a man you've never heard of.