High-quality black-and-white photographs of large old machines and tools

[Howder1951]

Yes Good Question,What were they Used for? Where are the Top Caps? Certainly Don't Put Your Fingers Anywhere Near Those Gears When Turning!

Looks like a gears for some large metal rolling equipment. the journals run on solid bearings and I am guessing those puppies will transmit something like 4-5000 HP.