A pair of Railway Signal Co. demonstration working scale model miniature electric staff instruments complete with bells and 30 staffs. The internal mechanisms, designed to work at 4.5 volts are created in miniature and have been tested as still in working order when connected together under power. Each stands approximately 11in tall and were built in around 1920 and are thought to be unique. The battery drawers are designed to take the now obsolete Ever Ready 1289 style of battery but could easily house an alternative battery pack.