A collection of six laboratory electric induction coils Unsigned, early 20th century The largest with 14 inch long by 7.5 inch diameter black celluloid-covered cylinder between Bakelite end caps incorporating brass post terminals, and mahogany panel supports fitted with substantial contact breaker to one end, standing on the moulded mahogany plinth base applied with pivoted switch and power supply connection posts, 76cm (30ins) wide; together with an iron ring Faraday coil, diameter 16.5cm (6.5ins), (7).