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ZUM4918643 Tue 03, 1954 - Admiralty survey ship in the Thames. H.M.S. Vidal - Equipped with helicopter. H.M.S. Vidal, first ship built for the Admiralty since the war specially for surveying duties and the first of the type to have a Helicopter flight deck and hanger - arrived in the themas today. The vessel has a langht of 315 ft. and a beam of 40 ft - and the deck arrangement is designed to make possible the flying off and flying on of helicopter - for air survey by .; (add.info.: Tue 03, 1954 - Admiralty survey ship in the Thames. H.M.S. Vidal - Equipped with helicopter. H.M.S. Vidal, first ship built for the Admiralty since the war specially for surveying duties and the first of the type to have a Helicopter flight deck and hanger - arrived in the themas today. The vessel has a langht of 315 ft. and a beam of 40 ft - and the deck arrangement is designed to make possible the flying off and flying on of helicopter - for air survey. photography and transport of parties to shore observations attestations. She carries three motor boats for survey purposes equipped with ache sounding aperture. photo shows View from inside the specially contrasted hanger on the flight deck of H.M.S. Vidal showing the??? Hiller??? H.S.2. Helicopter - at Tower Pier today); Photo ?? Keystone/Zuma; .