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invention of hex core

as far as I know, strings made of steel have always been made out of hexagonal cores, and round cores are rare. on guitars plain strings are always roundcore (because they are not wrapped), and wrapped strings are usually roundcore, since the first attempt to use steel strings on acoustic guitars in the late 19th century, before the invention of truss rods.
it's due to contact surface and stability between the core and the wrappings.

before steel strings, there were nylon strings, that succeded to the gut strings when Segovia found out that nylon sounded brighter and livelier than gut. after him, nylon strings became popular and used by many, until now that they are the standard on classical guitars.
 
I think D'Addario claims to be the first to us a hex core.

Here's from the D'Addario website:

What is a hexcore, and why is it better?

Pioneering innovative string design has been a D'Addario family tradition for nine generations. One such innovation is using carefully drawn, hexagonally shaped high carbon steel wire for the core of ALL of our wound steel strings. The six "edges" of the core wire bite into the softer wrap wire and better secure it all along its length. This tight bond between the core and wrap wire is crucial in producing a very consistent tone with better intonation.
 
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Hex core strings are now the norm for guitar and bass strings. You'll always pay a premium for round core strings, guitar or bass. I'm not sure why other than their claim to be "hand wound". I'll take precision made over hand made any day.

Round core always has a more supple feel. Not better, just more supple.
Hex core always has a stiffer feel. Not worse, just more stiff.
 
Does not look square to me.

hex.JPG
 
Interesting, which cores did you examine? I've read before on several sites that many of them are square, but I have not verified it myself.


These were Fender round wound bass, D'Addario round wound guitar, and another unidentified round wound bass string. I wasn't trying to categorize them, just collect general info about hex cores. So I didn't record the exact models.

It would also be interesting if some actually are square, and even more interesting if they were square and advertised as hex.

Do you know if there were microphotos like the one just above? Curious how it was determined that they were square.

I tried a quick search for square core and turned up nothing. But there is an octagonal core:

Invalid Link Removed

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Supple or not, I have a strong preference for Fatbeams now. (Same as Hibeams but wound more slowly). I recently tried low riders to try to get a harder sounding attack, & they were good, but actually the lo riders seamed brighter & more metallic. Furthermore I am surprised at how beefy those round cored DR strings sound, now that I have eliminated all my cheap lean sounding onboard preamps

I dont know where, maybe on TB, I once read that in the early days of the electric bass, the cores were round, then later (early 60s?) after the hex cored bass string came out, rounds quickly disappeared. You'd think info confirming that would be readily available.