Direktur, juga disebut prediktor tambahan, adalah komputer mekanik atau elektronik yang secara terus - menerus menghitung solusi penembakan trigonometri untuk digunakan terhadap target yang bergerak, dan mengirimkan data penargetan untuk mengarahkan kru penembakan senjata.

• T1 (wilson) director
• T4 gun director used with 3-inch M1918 gun
• T6 was built by Sperry Corporation in 1930 and standardized as the M2 director.
• M3 was standardized from the T8 in 1934
• M4 was standardized in 1939
• M5 Gun Director Mechanical, a US-produced Kerrison Predictor, for use with 37mm Gun M1 and M1 40 MM
  • M5A1
  • M5A2
• M7 gun director was standardized in 1941, and is similar to the M4 but added power control to the guns it is still described as a mechanical system. for use with 90 mm gun
  • M7A1B1
  • M7A1B2
• T10 standardized as M9 Gun Director electrical^[1] for use with 90 mm gun produced by Bell Labs
  • M9B1
• M10 gun director electrical for use with 120 mm M1 gun

• MK 51 Fire Control System
• Mark 56
• Mark 57
• Mark 58
• Mark 59
• Mark 92
• Type 6 director (PRC)

• TM 9-2300 Standard Artillery and Fire Control Materiel dated 1944
• Brooks, Brian L., Antiaircraft command: Preserving the history of U.S.Army antiaircraft artillery of World War II, Directors and height finders, [1]
• Lone Sentry.com, German Antiaircraft Artillery, Military Intelligence Service, Special Series 10, Feb. 1943, U.S. War Department, 1943
• Skylighters, A Beginner's Guide to the Skylighters, WW II Antiaircraft Artillery, Searchlights, and Radar, Skylighters.org Diarsipkan 2016-04-05 di Wayback Machine. January 10, 2004
• Brown, Louis, A Radar History of World War II: Technical and Military Imperatives, CRC Press, 1999
• Journal of the United States Artillery, v. 47, Artillery School (Fort Monroe, Va.), Coast Artillery Training Center (U.S.), 1917
• Dow Boutwell, William, Brodinsky, Ben, Frederick, Pauline, Pratt Harris, Joseph, Nixon, Glenn, Robertson, Archibald Thomas, America Prepares for Tomorrow; the Story of Our Total Defense Effort, Harper and brothers, 1941
• Evans, Nigel F., Laying and Orienting the Guns
• Bennett, Stuart, A History of Control Engineering, 1930–1955, IET, 199