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A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power. It is named for its most important component, a crystal detector, originally made from a piece of crystalline mineral such as galena ...
The crystal detector was the most successful of many detector devices invented during this era. The crystal detector evolved from an earlier device, [40] the first primitive radio wave detector, called a coherer, developed in 1890 by Édouard Branly and used in the first radio receivers in 1894–96 by Marconi and Oliver Lodge.
Geranium cinereum, the ashy cranesbill, is a species of flowering plant in the family Geraniaceae, native to the Pyrenees. Growing to 50 cm (20 in) tall and wide, it is a small, deciduous or semi- evergreen perennial usually grown for low ground cover, rockeries or underplanting larger subjects like roses.
Geranium × magnificum, the purple cranesbill, is a species of hardy flowering herbaceous perennial plant in the genus Geranium, family Geraniaceae. The multiplication symbol × indicates that it is the result of hybridisation, in this case between Geranium platypetalum and Geranium ibericum .
Low efficiency was the result, and germanium detector efficiency is still often quoted in relative terms to a "standard" 3″ x 3″ NaI(Tl) scintillation detector. Crystal growth techniques have since improved, allowing detectors to be manufactured that are as large as or larger than commonly available NaI crystals, although such detectors ...
Geranium californicum is a species of Geranium known by the common name California cranesbill. It is endemic to California , where it grows in the Sierra Nevada and coastal ranges in the southern part of the state.
The first device which used a scintillator was built in 1903 by Sir William Crookes and used a ZnS screen. [2] [3] The scintillations produced by the screen were visible to the naked eye if viewed by a microscope in a darkened room; the device was known as a spinthariscope.
Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals .