Beautifully engraved certificate from the Electric Amalgam Company issued in 1884. This historic document has an ornate border around it with a vignette of men by a shield. This item is hand signed by the Company's President and Treasurer and is over 118 years old.
Earth Light lamps contain amalgam - an alloy of various metals. The amalgam helps control the vapor pressure inside the compact fluorescent tube, maintaining stable light output over a wide range of temperatures.