synchronous belt
51Low Earth orbit — An orbiting cannon ball showing various sub orbital and orbital possibilities …
52Slow-scan television — (SSTV) is a picture transmission method used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color.A technical term for SSTV is narrowband television. Broadcast television requires huge 5, 6… …
53Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after …
54Brushed DC electric motor — A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. Contents 1 Simple two pole DC motor 2 The commutating plane 2.1 Compensation for stator field distortion …
55mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …
56neptune — /nep toohn, tyoohn/, n. any whelk of the genus Neptunea, esp. N. decemcostata, common along the eastern coast of North America and having a shell with seven to ten raised reddish brown spiral ridges on a pale beige or yellow background. [ < NL… …
57Neptune — /nep toohn, tyoohn/, n. 1. the ancient Roman god of the sea, identified with the Greek god Poseidon. 2. the sea or ocean: Neptune s mighty roar. 3. Astron. the planet eighth in order from the sun, having an equatorial diameter of 30,200 mi.… …
58Planetary ring — Shepherd moon redirects here. For the Enya album, see Shepherd Moons. The moons Prometheus and Pandora shepherd the F ring of Saturn. A planetary ring is a ring of cosmic dust and other small particles orbiting around a planet in a flat disc… …
59Direct drive mechanism — A Direct drive mechanism is one that takes the power coming from a motor without any reductions (such as a gearbox). Contents 1 Advantages 2 Disadvantages 3 Applications 3.1 High speed …
60Moons of Mars — Color image of Phobos obtaine …
