"Tricity Sun Ray" electric lamp for producing both light and heat, des igned as standard occasional table and lamp with black-painted base, c opper table and copper light diffusers which would have concealed 200 volt sausage-shaped Dowsing bulb, patent no 308,625 in 1927 by A. F. B erry, made by the British Electricity Transformer Co., English, 1927-1 930 "Tricity Sun Ray" electric lamp for producing both light and heat 1927-1930