|Samuel Pierpont Langley thermometry|
Langley’s ray-meter could detect body heat from a cow at a quarter of a mile, and measure heat from the moon at 238 thousand miles. * Two sets of platinum strips form two legs of a Wheatstone bridge connected to a galvanometer. One leg is exposed to radiant heat, affecting its resistance.
Nurses point infrared thermometers at your forehead, metalurgists point pyrometers at melting metals, and astronomers point bolometers at the moon.
At a distance
Gravity quietly pulls across space at the speed of light. Lines of magnetic force imperceptively pass through glass. Many implicitly accept the deceptions of politicians and con men, hoping there’s no gap between the future and their dreams.