Chevrons

This is part of a herringbone gear wheel.
André Citroën*, the founder of the Citroën motor company bought the patent for the gear and from it devised the double helical gear.
The Citroën logo is attributed to the chevron formation of the herringbone gear wheel.
I made this pic. as an illustration of the logo's supposed derivation and as a photoshop exercise: https://365project.org/dulciknit/on-the-day-extr/2021-10-30

* https://en.wikipedia.org/wiki/Andr%C3%A9_Citro%C3%ABn

[Milanie]

Another gem of a black and white

[Graham]

Fascinating story and a wonderful image too.

[Phil Howcroft]

i did know that, but then i am a bit geeky alison, thanks for all your great comments and support

[Brian]

Cool & Interesting

[Netkonnexion]

Ah, I see. OK. Different. Like the tones here.