Herringbone Pinion Gears

These herringbone gears were part of updating my old Thing-O-Matic:

Herringbone gears with nut inserts
Herringbone gears with nut inserts

But, as the saying goes, that’s not a herringbone gear. This is a herringbone gear:

Bethlehem Steel - 48 inch rolling mill gears
Bethlehem Steel – 48 inch rolling mill gears

We always read the signage:

Bethlehem Steel - 48 inch rolling mill gears - description
Bethlehem Steel – 48 inch rolling mill gears – description

They’re parked in front of the National Museum of Industrial History in Bethlehem, PA.