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ZUM4918443 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 especially for surveying duties and the first of the type to have a helicopter flight deck and hanger - arrived in the Thames today. The vessel has a length 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 stations. She carries three motor boats for survey purpose equipment with echo sounding apparatus 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 especially for surveying duties and the first of the type to have a helicopter flight deck and hanger - arrived in the Thames today. The vessel has a length 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 stations. She carries three motor boats for survey purpose equipment with echo sounding apparatus. Photo shows A??? Hiller??? H.S.O. Helicopter is wheeled out on to the specially constructed flight deck from the hangar - seen behind - at Tower Pier today); Photo ?? Keystone/Zuma; .