In 1864, the RDS held an Exhibition of Manufactures in a purpose built building. Known as the Shelbourne Hall, it became an annexe of the museum housing the fossil hall and staff facilities. By 1867 the museum was open 4 days a week, and undertook to open for one evening every week. Due to the success of the evening opening it then remained open for two evenings each week. At this time the idea of Sunday openings was suggested, but did not happen until 1884. In 1870 the museum was visited by 103,237 members of the public.