At royal request, Bradley printed the Opium Edict in 1839, which marked the beginning of printing public documents in Siam. Mongkut took a strong interest in the printing press and after he took a visit to London, Bradley and Mongkut made the first copyright transaction in the history of Siam in 1862, a travel journal of Mongkut’s visit. With royal approval, Bradley founded the first newspaper in Siam, "The Bangkok Recorder" which was published monthly from 1844-1845 and 1865-1867. He also printed the annual almanac, "The Bangkok Calendar", from 1859 till his death.