After the First World War , Halestrap was employed by Marconi .
After the First World War , Halestrap was worked with Cyril Evans , who had been the Californian 's wireless operator on the night of the Titanic disaster .
After the First World War , Halestrap was employed by Marconi and worked with Cyril Evans , who had been the Californian 's wireless operator on the night of the Titanic disaster .