41. 16" BC section of base ring Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
42. 16" DC carriage in pit Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
43. 16" DC model 1917 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1917] Institution: National Archives at Boston
44. 16" Howitzer locking hoop being quenched, weight 32,500 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
45. 240 MM shell, finish turning base in preparation for base cover Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 1945 Institution: National Archives at Boston
46. 240 MM shell, finish turning bourrelet Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: July 30, 1945 Institution: National Archives at Boston
47. 240 MM shell, showing method of setting tool by indicator for finish turning bourrelet Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: July 30, 1945 Institution: National Archives at Boston
48. 240 MM shell, transfer of rotating band from induction furnace to banding press Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 1945 Institution: National Archives at Boston
49. 2400 Ft-Lb Charpy machine, bldg 71 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1959–1962] Institution: National Archives at Boston
50. 2400 Ft-Lb Charpy Machine, bldg 71 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1959–1962] Institution: National Archives at Boston
51. 2,400,000 lb hydraulic tension-compression testing machine Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1959–1962] Institution: National Archives at Boston
52. 2,400,000 lbs. capacity tension-compression testing machine Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1964] Institution: National Archives at Boston
53. 2,400,000-lb hydraulic tension-compression testing machine Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1959–1962] Institution: National Archives at Boston
54. 3" AA assembly line, building 36 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 14, 1937 Institution: National Archives at Boston
55. 3" AA fuse setter M-5 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: September 15, 1936 Institution: National Archives at Boston
56. 305 MM sliding railway mounts 3 and 4 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
57. 34 year old floor mill machining 3" AA bogie Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: December 22, 1938 Institution: National Archives at Boston
58. 4-spindle hydrotel vertical automatic hydaulic operated machine for milling, regular contours Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1942–1959] Institution: National Archives at Boston
59. 500 lb vacuum furnace Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 8, 1960 Institution: National Archives at Boston
60. 76 MM gun tube burst by hydraulic pressure Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 3, 1943 Institution: National Archives at Boston