421. View of tubes inside EC-2 vessel boiler by Babcock and Wilcox Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
422. EC-2 vessel boiler by Babcock and Wilcox Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
423. Diagram showing 2 rows of drum internals for the U.S.S. North Carolina Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Date: undated Format: Image Agent: unknown
424. Inside a textile mill factory with automatic spinning of thread. Probably Industrial Rayon Corporation's continuous processing machines. Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Location: unknown Date: 1939 Format: Image Agent: unknown
425. Babcock & Wilcox separately-fired superheater unit Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: unknown Date: undated Format: Image Agent: unknown
426. Photograph of factory where 10,000 automobile frames a day are manufactured using automation. Collection: Early 20th Century Engineering Lantern Slides Set: Machinery Location: Milwaukee, WI Date: undated Format: Image Agent: unknown
