Large Iolanda Switchboard, by Marconi Company, London, Early 20th Century

Large Iolanda Switchboard, with voltmeter, ammeter and doubl-throw switch upon black-painted ebonite surface mounted vertically on four support legs. With two almost identical glass-fronted cylindrical brass metres, both with half-moon dial scales and half of front glass surface painted with unit scales. Dial scales are 0, 50, 100, 150, 200, 250 [volts] and 0, 10, 20, 30 [amperes] respectively. With double-throw switch consisting of assorted copper, lacquered brass, ebonite and plastic? components. Also with two small cylinders, covered in an unidentified varnished material, mounted between two lacquered brass terminals each. With illuminating lamp with steel? shell-shaped covering mounted on lacquered brass base upon switchboard.