The semaphore telegraph system was invented in 1792, and the British military authorities began to consider installing such a system in Malta in the early 1840s. Initially, it was planned that semaphore stations be established on the bell towers and domes of the island's churches, but the religious authorities rejected the proposal. Due to this, in 1848 new semaphore towers were constructed at Nadur on Gozo, and Għargħur and Għaxaq on the main island of Malta. Further stations were established at the Governor's Palace in Valletta, Selmun Palace near Mellieħa, and the Giordan Lighthouse near Għasri, Gozo. Each station was manned by the Royal Engineers.