Word: quartz
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...Douglas, Instructor in Geology, to purchase a quartz spectograph for determining the minor constituents of minerals, ores, and rocks, and the composition of minute grains too small to be analyzed in other ways...
...England, a saucer-shaped depression in chalk cliffs of the Medway Valley was found to contain relics, thought to date from mid-Pleistocene times (50,000 years ago). The relics: a "workshop," with 4,000 tools in 17 heaps-hand axes of flint flakes, hammerstones of quartz, corepieces and nodules of flint...
Whenever the heart beats, electricity flows over the body's circuit. Dr. Einthoven's device records the fluctuations of this current by means of two wires of quartz, so fine that they are invisible even under a microscope, unless thrown into relief by light against a dark background. These wires are threaded across the magnetic field formed between the polar ends of an electromagnet. In each pole of the magnet is screwed a microscope, one lending light, the other enlargement. Rubber manacles are placed over the wrists of the patient. Under each manacle is a salt pad (electric...
Professor Miethe's reported discovery that quicksilver could be transformed into gold, an apparent solution of an age-old problem and a realization of the dream of ancient alchemists, was an accident, as were many other scientific discoveries. Using a quartz lamp and quicksilver vapor, he was endeavoring to determine the effect of ultra violet rays upon certain materials. An electric current of 170 volts and of a comparatively low amperage was passed through the lamp...
After 200 hours with this current he observed that the apparatus had become less efficient. He took it apart and found that the inside of the quartz lamp had become coated with a black film. Upon subjecting this film to chemical analysis he found that he had produced accidentally a small quantity of gold...