21. Oscillating screen in breaker, Scranton, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
22. Oscillating screen in breaker, Scranton, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
23. Polishing plate glass after grinding, Rossford, Ohio Format: Photographs Collection: Stereograph Collection Date: [ca. 1879–1930] Institution: Boston Public Library
24. Polishing rice, Savannah, Ga. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
25. A revolving steam drier for salt, St. Clair, Michighan Format: Photographs Collection: Stereograph Collection Date: [ca. 1879–1930] Institution: Boston Public Library
26. Shipping coal - coal breaker in background, Ashley, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1909 Institution: Boston Public Library
27. Shipping coal - coal breaker in background, Ashley, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1909 Institution: Boston Public Library
28. Slate pickers, anthracite coal mining, Scranton, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
29. Steel ingot on table of blooming mil[?] Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
30. Stripping off the surface dirt, Mesabi Range, Minn. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
31. Tandem automatic slate picker, Scranton, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
32. Tandem automatic slate picker, Scranton, Pa. Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
33. Trip hammer, steel works Format: Photographs Collection: Stereograph Collection Date: (c) 1905 Institution: Boston Public Library
34. 1 305 MM sliding railway mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
35. #1 Washer, Pioneer Mill, 1939 Format: Photographs Collection: Photo Collection Date: 1939 Institution: Crane Museum of Papermaking
36. 1,000,000 lb. capacity horizontal tensile machine Creator: U.S. Army Materials and Mechanics Research Center. Public Affairs Office; Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1967–1984] Institution: National Archives at Boston
37. 1,000,000 lb. capacity horizontal tensile machine Creator: U.S. Army Materials and Mechanics Research Center. Public Affairs Office; Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1967–1984] Institution: National Archives at Boston
38. 1200 KVA high frequency motor generator set Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1939–1959] Institution: National Archives at Boston
39. 16" Barbette carriage Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1920] Institution: National Archives at Boston
40. 16" Barbette carriage Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1920] Institution: National Archives at Boston
![Steel ingot on table of blooming mil[?]](https://bpldcassets.blob.core.windows.net/derivatives/images/commonwealth:dj52wj86p/image_thumbnail_300.jpg)
