Show lights float on mercury there is said to te be an increasing demand for quicksilver in the manufacture of electric appliances an in te resting and increasing use in scotland Is elie floating of the lights of lighthouses upon a body of quicksilver the metal Is not consumed of course and the loss in use Is insignificant ant it appears that the commissioners commissioner of northern lighthouses in edinburgh hae in their charge ninety lighthouses on the coast of scotland up to a few years ago the revolving lights were borne on rollers tile the float system has been gradually introduced trod however and Is now in operation at thirty coast stations and will be used at all others the lighting machinery rests in a groove the quantity of mercury required for this purpose in a lighthouse Is arbin seven to eight flacks flasks of seventy five pounds each the argonaut |