ASDIC

TREASON TUESDAY/1993-2021, May 18/2021@18:55- IN MEMORY OF SUBMARINE DETECTOR…ASDIC OPERATOR, ROYAL CANADIAN NAVAL VOLUNTEER RESERVE…MURZA, John Andrew, V-82787, A/AB, A-CLASS INSTRUCTOR’S COURSE, H.M.C.S. YORK/June-August-1944, CAPTAIN D-DESTROYERS/Halifax Dockyard, Halifax, Nova Scotia, Canada, HIS MAJESTY’S CANADIAN SHIPS-VISON Z 30, CARLPLACE K 664, BORDER CITIES J 344, SERVED-Canada and ON THE HIGH SEAS, Medals Earned-The Atlantic Star, The Canadian Volunteer Service Medal, 1939-1945 War Medal, Discharged … Honourable Discharge, Very Good Character, @ H.M.C.S. HUNTER…W.W.II SERVICE/Hostilities Only.

Research: William HACKMANN-SEEK and STRIKE, BOOK ON ASDIC, SONAR, RADAR, etc., in W.W.II/1939-1945!!!

Blog Credit: MSW, Weapons and Warfare

Yours Aye: Brian Murza…Killick Vison, W.W.II Naval Researcher-Published Author, Niagara Falls, Ontario, Canada.

Weapons and Warfare

This pictorial illustrates the shape of the detection area for the 144 ASDIC, the ‘Q; attachment and the 147 Asdic. Click on graphic to enlarge.

From “Anti- Submarine Detection Investigation Committee,” dating to British, French, and American anti-submarine warfare research during World War I. Known as ASDIC (Admiralty’s Anti-Submarine Division) in British and Commonwealth navies until the 1950s and the most important underwater detection device since the interwar period. Sonar takes two forms: active, emitting sonic impulses and measuring distance and direction through receiving their reflections; and passive, determining bearing and range through comparative analysis of received sound.

The Allied Submarine Detection Investigation Committee produced an experimental set in 1918, but the first operational units went to sea only in 1928 (aboard British A-class destroyers). All were “searchlight” units using high-frequency emissions (20–40 kilocycles). They had short ranges (to 3,500 yards) and were ineffective at speeds much above 15…

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