Manufacturing process underway at Otis Elevator Works in Chicago, Illinois. This image shows a Type 9 Otis triple bar boring mill being used to finish bore recuperators and brake cylinders for the government. The process is part of the production of 240 mm recuperators. This photograph is from the collection of American Military Activities during World War One.

---

Size: 8565px × 5795px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 9, 240, activities, american, bar, boring, brake, chicago, cpi, cylinders, elev, elevator, finish, folge, government, illinois, issued, manufacturing, military, mill, mm, notes, official, otis, photograph, photographer, recuperators, triple, type, war, works, world