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A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency counters usually measure the number of cycles of oscillation or pulses per second in a periodic electronic signal. Such an instrument is sometimes called a cymometer, particularly one of Chinese manufacture. [citation needed]
Tale of the tape. Heavyweight champions Rocky Marciano and Jersey Joe Walcott fought two historic boxing matches in 1952 and 1953. The first fight saw Marciano, the undefeated challenger, take on the world heavyweight champion Jersey Joe in a hard-fought championship fight. The fight culminated in a 13th round knockout scored by Marciano, in a ...
A foxhole radio is a makeshift radio that was built by soldiers in World War II for entertainment, to listen to local radio stations using amplitude modulation. [1][2] They were first reported at the Battle of Anzio, Italy, spreading later across the European and Pacific theaters. The foxhole radio was a crude crystal radio which used a safety ...
A Geiger counter (/ ˈ ɡ aɪ ɡ ər /, GY-gər; [1] also known as a Geiger–Müller counter or G-M counter) is an electronic instrument used for detecting and measuring ionizing radiation. It is widely used in applications such as radiation dosimetry , radiological protection , experimental physics and the nuclear industry .
Frequency meter. Microwave-frequency absorption frequency (or wave) meter. A frequency meter is an instrument that displays the frequency of a periodic electrical signal. Various types of mechanical frequency meters were used in the past, but since the 1970s these have almost universally been replaced by digital frequency counters.
A World War II print advertisement for Baldwin (Whitcomb) "Little Giant" switcher locomotives.. The Geo D. Whitcomb Company was founded by George Dexter Whitcomb (1834–1914), of Chicago, Illinois, who started a modest machine shop in 1878, and began the manufacture of coal mining machinery, laying the foundation for the concern that became known as The Whitcomb Locomotive Company.
v. t. e. In electronics, a Dekatron (or Decatron, or generically three-phase gas counting tube or glow-transfer counting tube or cold cathode tube) is a gas-filled decade counting tube. Dekatrons were used in computers, calculators, and other counting-related products during the 1950s and 1960s. "Dekatron" was the brand name used by Ericsson ...
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio ...