ISBN) (An autobiography of Sir Robert Watson-Watt) Zimmerman, David., Britain's Shield Radar and the Defeat of the Luftwaffe, Sutton Publishing, 2001, External links Radarworld.org: Radar World website Radarworld.org: "Radar Family Tree" — by Martin Hollmann. PenleyRadarArchives.org: "Early Radar History – an Introduction" — by Bill + Jonathan Penley (2002). Fas.org: "Introduction to Naval Weapons Engineering" — Radar fundamentals section. Foundation Centre for German Communications and Related Technologies: "Christian Hülsmeyer and about the early days of radar inventions" — by Arthur O. Bauer. Purbeckradar.org: Early radar development in the UK Hist.rloc.ru: "A History of Radio Location in the USSR"— Jahre-radar.de: "100 Years of Radar"— Jahre-radar.de: "The Century of Radar – from Christian Hülsmeyer to Shuttle Radar Topography Mission"—, by Wolfgang Holpp. World War II The Radar Pages.uk: "All you ever wanted to know about British air defence radar" — history and details of various British radar systems, by Dick Barrett. The Radar Pages.uk: Deflating British Radar Myths of World War II — by Maj. Gregory C. Clark (1997). The Secrets of Radar Museum: "Canada's involvement in WWII Radar" Navweaps.com: German Radar Equipment of World War II Articles containing video clips Radar Radar