COLD LIGHT - CAPTAIN S. P. MEEK
How Could a Human Body Be Found Actually Splintered––Broken into Sharp Fragments Like a Shattered Glass! Once Again Dr. Bird Probes Deep into an Amazing Mystery.
BRIGANDS OF THE MOON - RAY CUMMINGS
Black Mutiny and Brigandage Stalk the Space-ship Planetara as She Speeds to the Moon to Pick Up a Fabulously Rich Cache of Radium-ore.
THE SOUL MASTER - WILL SMITH AND R. J. ROBBINS
Desperately O’Hara Plunged into Prof. Kell’s Mysterious Mansion. For His Friend Skip Was the Victim of the Eccentric Scientist’s De-astralizing Experiment, and Faced a Fate More Hideous than Death.
FROM THE OCEAN’S DEPTHS - SEWELL PEASLEE WRIGHT
Man Came from the Sea. Mercer, by His Thought-telegraph, Learns from the Weirdly Beautiful Ocean-maiden of a Branch that Returned There.
VANDALS OF THE STARS - A. T. LOCKE
A Livid Flame Flares Across Space––and Over Manhattan Hovers Teuxical, Vassal of Malfero, Lord of the Universe, Who Comes with Ten Thousand Warriors to Ravage and Subjugate One More Planet for His Master.
"A searchlight is merely a source of light, and of course, of heat, which is placed at the focus of a parabolic reflector so that all of the rays emanating from the source travel in parallel lines. A searchlight, of course, gives off heat. If we place a lens of the same size as the searchlight aperture in the path of the beam and concentrate all the light, and heat, at one spot, the focal point of the lens, the temperature at that point is the same as the temperature of the source of the light, less what has been lost by radiation. You understand that, do you not?"
"Suppose that we place at the center of the aperture of the searchlight a small opaque disc which is permeable neither to heat nor light, in such a manner as to interrupt the central portion of the beam. As a result, the beam will go out in the form of a hollow rod, or pipe, of heat and light with a dark, cold core. This core will have the temperature of the surrounding air plus the small amount which h