sitting rooms, three bedrooms, and two dressing rooms, as well as a kitchen, water closet and shed, but with mirrored layouts. Number 18 was expanded with additions built in the 1890s. Gatehouse The gatehouse and associated entry complex was constructed between 1854 and 1855 using convict labour. It was designed by Royal Engineer and Comptroller General Edmund Henderson, and constructed out of limestone. The gatehouse has two towers either side of a narrow gate, reminiscent of those found in 13th century English castles or walled cities. Iron that had been scavenged from shipwrecks was used to make the gate, while the clock at the top of the structure was imported from England. As the main entrance, the gatehouse has remained a significant feature and landmark; since the closure of the prison, it has housed a café and office areas. Restoration was carried out in 2005, preserving the original stone facade and removing non-original rendering. Main Cell Block Little-changed since its construction in the 1850s by convicts, the Main Cell Block was designed to hold up to 1000 prisoners. The central, four-storey high cell block is flanked on either end by large dormitory wards, called the Association Rooms. Here, as many as 80 men slept in hammocks, either as a reward for good behaviour or because they would soon receive their ticket of leave. In contrast, the cramped cells measured just . Although each cell initially had a basin connected to running water, the installation was before the advent of S-bends; the smells coming up the pipes led to their removal by the 1860s. Following a Royal Commission, the cells were enlarged by removing a dividing wall from between two cells. Electric lighting was installed in the 1920s, but there were never any toilets – buckets were used for the duration of the prison's operation. Since the prison's closure, six cells have been restored to represent the varying living conditions at different times in the prison's history. The main block also houses the gallows, solitary confinement cells, and two chapels – Anglican and Catholic. New Division Fremantle Prison's New Division building was constructed between 1904 and 1907, as a response to overcrowding. It also allowed prison administrators to implement the "separate system", whereby prisoners were completely isolated for the first three months of their sentence. A panopticon in the exercise yard was initially used to facilitate this concept during the prisoners'