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Technology Prevalence Heatmap by Period
BOF Annual Reports, 1897–1908 · cell shade = subject count (capped at 130). Hover a cell to spotlight its row and column. Original analysis by Tanisha.
 Projectiles & Ammunition · 1897-98: 130 subjects 130 Projectiles & Ammunition1897-98130 subjects Projectiles & Ammunition · 1898-99: 22 subjects 22 Projectiles & Ammunition1898-9922 subjects Projectiles & Ammunition · 1900-01: 27 subjects 27 Projectiles & Ammunition1900-0127 subjects Projectiles & Ammunition · 1901-02: 28 subjects 28 Projectiles & Ammunition1901-0228 subjects Projectiles & Ammunition · 1903-04: 22 subjects 22 Projectiles & Ammunition1903-0422 subjects Projectiles & Ammunition · 1904-05: 18 subjects 18 Projectiles & Ammunition1904-0518 subjects Projectiles & Ammunition · 1905-06: 20 subjects 20 Projectiles & Ammunition1905-0620 subjects Projectiles & Ammunition · 1906-07: 23 subjects 23 Projectiles & Ammunition1906-0723 subjects Projectiles & Ammunition · 1907-08: 22 subjects 22 Projectiles & Ammunition1907-0822 subjects Artillery & Guns · 1897-98: 68 subjects 68 Artillery & Guns1897-9868 subjects Artillery & Guns · 1898-99: 39 subjects 39 Artillery & Guns1898-9939 subjects Artillery & Guns · 1900-01: 38 subjects 38 Artillery & Guns1900-0138 subjects Artillery & Guns · 1901-02: 53 subjects 53 Artillery & Guns1901-0253 subjects Artillery & Guns · 1903-04: 52 subjects 52 Artillery & Guns1903-0452 subjects Artillery & Guns · 1904-05: 38 subjects 38 Artillery & Guns1904-0538 subjects Artillery & Guns · 1905-06: 31 subjects 31 Artillery & Guns1905-0631 subjects Artillery & Guns · 1906-07: 32 subjects 32 Artillery & Guns1906-0732 subjects Artillery & Guns · 1907-08: 25 subjects 25 Artillery & Guns1907-0825 subjects Other · 1897-98: 48 subjects 48 Other1897-9848 subjects Other · 1898-99: 20 subjects 20 Other1898-9920 subjects Other · 1900-01: 13 subjects 13 Other1900-0113 subjects Other · 1901-02: 52 subjects 52 Other1901-0252 subjects Other · 1903-04: 41 subjects 41 Other1903-0441 subjects Other · 1904-05: 17 subjects 17 Other1904-0517 subjects Other · 1905-06: 23 subjects 23 Other1905-0623 subjects Other · 1906-07: 25 subjects 25 Other1906-0725 subjects Other · 1907-08: 34 subjects 34 Other1907-0834 subjects Torpedoes & Mines · 1897-98: 42 subjects 42 Torpedoes & Mines1897-9842 subjects Torpedoes & Mines · 1898-99: 6 subjects 6 Torpedoes & Mines1898-996 subjects Torpedoes & Mines · 1900-01: 3 subjects 3 Torpedoes & Mines1900-013 subjects Torpedoes & Mines · 1901-02: 3 subjects 3 Torpedoes & Mines1901-023 subjects Torpedoes & Mines · 1903-04: 9 subjects 9 Torpedoes & Mines1903-049 subjects Torpedoes & Mines · 1904-05: 12 subjects 12 Torpedoes & Mines1904-0512 subjects Torpedoes & Mines · 1905-06: 8 subjects 8 Torpedoes & Mines1905-068 subjects Torpedoes & Mines · 1906-07: 5 subjects 5 Torpedoes & Mines1906-075 subjects Torpedoes & Mines · 1907-08: 8 subjects 8 Torpedoes & Mines1907-088 subjects Aerial / Aviation · 1897-98: 29 subjects 29 Aerial / Aviation1897-9829 subjects Aerial / Aviation · 1898-99: 51 subjects 51 Aerial / Aviation1898-9951 subjects Aerial / Aviation · 1900-01: 1 subjects 1 Aerial / Aviation1900-011 subjects Aerial / Aviation · 1901-02: 5 subjects 5 Aerial / Aviation1901-025 subjects Aerial / Aviation · 1903-04: 18 subjects 18 Aerial / Aviation1903-0418 subjects Aerial / Aviation · 1904-05: 4 subjects 4 Aerial / Aviation1904-054 subjects Aerial / Aviation · 1905-06: 7 subjects 7 Aerial / Aviation1905-067 subjects Aerial / Aviation · 1906-07: 8 subjects 8 Aerial / Aviation1906-078 subjects Aerial / Aviation · 1907-08: 13 subjects 13 Aerial / Aviation1907-0813 subjects Armor & Fortification · 1897-98: 23 subjects 23 Armor & Fortification1897-9823 subjects Armor & Fortification · 1898-99: 4 subjects 4 Armor & Fortification1898-994 subjects Armor & Fortification · 1900-01: 3 subjects 3 Armor & Fortification1900-013 subjects Armor & Fortification · 1901-02: 9 subjects 9 Armor & Fortification1901-029 subjects Armor & Fortification · 1903-04: 17 subjects 17 Armor & Fortification1903-0417 subjects Armor & Fortification · 1904-05: 11 subjects 11 Armor & Fortification1904-0511 subjects Armor & Fortification · 1905-06: 6 subjects 6 Armor & Fortification1905-066 subjects Armor & Fortification · 1906-07: 9 subjects 9 Armor & Fortification1906-079 subjects Armor & Fortification · 1907-08: 7 subjects 7 Armor & Fortification1907-087 subjects Explosives & Propellants · 1897-98: 23 subjects 23 Explosives & Propellants1897-9823 subjects Explosives & Propellants · 1898-99: 9 subjects 9 Explosives & Propellants1898-999 subjects Explosives & Propellants · 1900-01: 9 subjects 9 Explosives & Propellants1900-019 subjects Explosives & Propellants · 1901-02: 7 subjects 7 Explosives & Propellants1901-027 subjects Explosives & Propellants · 1903-04: 8 subjects 8 Explosives & Propellants1903-048 subjects Explosives & Propellants · 1904-05: 5 subjects 5 Explosives & Propellants1904-055 subjects Explosives & Propellants · 1905-06: 1 subjects 1 Explosives & Propellants1905-061 subjects Explosives & Propellants · 1906-07: 3 subjects 3 Explosives & Propellants1906-073 subjects Explosives & Propellants · 1907-08: 4 subjects 4 Explosives & Propellants1907-084 subjects Range Finding & Fire Control · 1897-98: 17 subjects 17 Range Finding & Fire Control1897-9817 subjects Range Finding & Fire Control · 1898-99: 12 subjects 12 Range Finding & Fire Control1898-9912 subjects Range Finding & Fire Control · 1900-01: 9 subjects 9 Range Finding & Fire Control1900-019 subjects Range Finding & Fire Control · 1901-02: 13 subjects 13 Range Finding & Fire Control1901-0213 subjects Range Finding & Fire Control · 1903-04: 17 subjects 17 Range Finding & Fire Control1903-0417 subjects Range Finding & Fire Control · 1904-05: 14 subjects 14 Range Finding & Fire Control1904-0514 subjects Range Finding & Fire Control · 1905-06: 18 subjects 18 Range Finding & Fire Control1905-0618 subjects Range Finding & Fire Control · 1906-07: 10 subjects 10 Range Finding & Fire Control1906-0710 subjects Range Finding & Fire Control · 1907-08: 15 subjects 15 Range Finding & Fire Control1907-0815 subjects Small Arms · 1897-98: 9 subjects 9 Small Arms1897-989 subjects Small Arms · 1898-99: 4 subjects 4 Small Arms1898-994 subjects Small Arms · 1900-01: 4 subjects 4 Small Arms1900-014 subjects Small Arms · 1901-02: 14 subjects 14 Small Arms1901-0214 subjects Small Arms · 1903-04: 9 subjects 9 Small Arms1903-049 subjects Small Arms · 1904-05: 5 subjects 5 Small Arms1904-055 subjects Small Arms · 1905-06: 7 subjects 7 Small Arms1905-067 subjects Small Arms · 1906-07: 4 subjects 4 Small Arms1906-074 subjects Small Arms · 1907-08: 3 subjects 3 Small Arms1907-083 subjects Searchlights & Optics · 1897-98: 2 subjects 2 Searchlights & Optics1897-982 subjects Searchlights & Optics · 1898-99: 2 subjects 2 Searchlights & Optics1898-992 subjects Searchlights & Optics · 1900-01: 3 subjects 3 Searchlights & Optics1900-013 subjects Searchlights & Optics · 1901-02: 3 subjects 3 Searchlights & Optics1901-023 subjects Searchlights & Optics · 1903-04: 10 subjects 10 Searchlights & Optics1903-0410 subjects Searchlights & Optics · 1904-05: 7 subjects 7 Searchlights & Optics1904-057 subjects Searchlights & Optics · 1905-06: 5 subjects 5 Searchlights & Optics1905-065 subjects Searchlights & Optics · 1906-07: 22 subjects 22 Searchlights & Optics1906-0722 subjects Searchlights & Optics · 1907-08: 10 subjects 10 Searchlights & Optics1907-0810 subjects Entrenching & Field Equip. · 1897-98: 0 subjects 0 Entrenching & Field Equip.1897-980 subjects Entrenching & Field Equip. · 1898-99: 3 subjects 3 Entrenching & Field Equip.1898-993 subjects Entrenching & Field Equip. · 1900-01: 10 subjects 10 Entrenching & Field Equip.1900-0110 subjects Entrenching & Field Equip. · 1901-02: 10 subjects 10 Entrenching & Field Equip.1901-0210 subjects Entrenching & Field Equip. · 1903-04: 8 subjects 8 Entrenching & Field Equip.1903-048 subjects Entrenching & Field Equip. · 1904-05: 7 subjects 7 Entrenching & Field Equip.1904-057 subjects Entrenching & Field Equip. · 1905-06: 3 subjects 3 Entrenching & Field Equip.1905-063 subjects Entrenching & Field Equip. · 1906-07: 1 subjects 1 Entrenching & Field Equip.1906-071 subjects Entrenching & Field Equip. · 1907-08: 0 subjects 0 Entrenching & Field Equip.1907-080 subjects Transportation & Vehicles · 1897-98: 2 subjects 2 Transportation & Vehicles1897-982 subjects Transportation & Vehicles · 1898-99: 2 subjects 2 Transportation & Vehicles1898-992 subjects Transportation & Vehicles · 1900-01: 3 subjects 3 Transportation & Vehicles1900-013 subjects Transportation & Vehicles · 1901-02: 5 subjects 5 Transportation & Vehicles1901-025 subjects Transportation & Vehicles · 1903-04: 5 subjects 5 Transportation & Vehicles1903-045 subjects Transportation & Vehicles · 1904-05: 0 subjects 0 Transportation & Vehicles1904-050 subjects Transportation & Vehicles · 1905-06: 4 subjects 4 Transportation & Vehicles1905-064 subjects Transportation & Vehicles · 1906-07: 0 subjects 0 Transportation & Vehicles1906-070 subjects Transportation & Vehicles · 1907-08: 4 subjects 4 Transportation & Vehicles1907-084 subjects Wireless & Electrical · 1897-98: 4 subjects 4 Wireless & Electrical1897-984 subjects Wireless & Electrical · 1898-99: 5 subjects 5 Wireless & Electrical1898-995 subjects Wireless & Electrical · 1900-01: 2 subjects 2 Wireless & Electrical1900-012 subjects Wireless & Electrical · 1901-02: 8 subjects 8 Wireless & Electrical1901-028 subjects Wireless & Electrical · 1903-04: 2 subjects 2 Wireless & Electrical1903-042 subjects Wireless & Electrical · 1904-05: 1 subjects 1 Wireless & Electrical1904-051 subjects Wireless & Electrical · 1905-06: 0 subjects 0 Wireless & Electrical1905-060 subjects Wireless & Electrical · 1906-07: 0 subjects 0 Wireless & Electrical1906-070 subjects Wireless & Electrical · 1907-08: 3 subjects 3 Wireless & Electrical1907-083 subjects Projectiles & Ammunition Artillery & Guns Other Torpedoes & Mines Aerial / Aviation Armor & Fortification Explosives & Propellants Range Finding & Fire Control Small Arms Searchlights & Optics Entrenching & Field Equip. Transportation & Vehicles Wireless & Electrical 1897-98 1898-99 1900-01 1901-02 1903-04 1904-05 1905-06 1906-07 1907-08 BOF reporting period 0 130 Subjects