Mid Canada Line (Canadian Civil Defence Museum, with Thorne 1979 and Buss 1957)

The Canadian Civil Defence Museum’s Mid-Canada Line page, which reproduces Maj. D.H. Thorne’s 1979 retrospective (the final cost figure of $224,566,830 against the $120M estimate, and the February 1953 tasking of the Canada-US Military Study Group) and quotes Lydus H. Buss’s period CONAD history ‘U.S. Air Defense in the Northeast 1940-1957’ (1 April 1957) - the cleanest period-primary description of the fence physics: an unmodulated continuous-wave signal, a beat frequency in the receiver when something crosses, ‘essentially a trip-wire system.’