The American Army show off a device which uses the power of the sun to burn through steel.
Full title reads: "Massachusetts. 'Sun Furnace' Starts Work".
Natick, Massachusetts, United States of America (USA).
GV The new American army solar furnace. SV The reflector mirrors of the furnace which is called a Heliostat. CU The concave concentrating mirror. CU The adjustable venetian blind type device and the blinds close. CU The blinds, and the heart of the furnace. CU Man at controls. CU Heart of furnace. CU Man at controls. CU A reacting device. CU Lt. General Arthur Trudeau another officer preparing to set furnace into action by pressing a button, which he does. CU Flames and smoke belching from the heart of the furnace, the venetian blind device closes and the smoke and flames cease immediately. CU Lt. General Arthur Trudeau and another officer watching. CU Heart of furnace and this time they are burning a hole in a piece of construction steel 1/4 inch thick and already flames and smoke are rising and growing more, so venetian blind closes and flames and smoke begin to die down.