A Pair of Concave Mirrors Set Facing Each Other

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“If a pair of concave mirrors be set facing each other, as shown in figure 7, and a source of heat be placed in the focus of one, a thermometer in the focus of the other will quickly show a rise in temperature though the mirrors are many feet apart.” Louis Derr, 1911

Keywords

energy, concave, Radiation, a pair of concave mirrors, radiant energy, concave mirrors, refraction wave motion in ether, forms of energy

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Steam Power Generation

Source

Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)

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