 Watt was waiting for the order , and in 1938 had arranged for production of the transmitters at Metrovick and receivers at A.C. Cossor . These turned out to be the wrong products : Metrovick had been told to directly copy ( " Chinese " ) the 1937 design by Percy Hibberd , but Bawdsey had delivered the wrong prototype to Metrovick , who copied it . The Cossor receivers were found to be unusable , weighing as much as the entire transmitter and receiver , and having sensitivity about half that of the EMI lash @-@ up . 
