planetary reduction gear
41Calendar of 1998 — ▪ 1999 January January 1 At the stroke of the new year, the Russian ruble is worth a thousand times less than before as three zeros are removed from its value; about six new rubles equal one U.S. dollar. Foreign Minister David Levy… …
42Mechanism (engineering) — A mechanism is a device designed to transform input forces and movement into a desired set of output forces and movement. Mechanisms generally consist of moving components such as gears and gear trains, belt and chain drives, cam and follower… …
43Mars Science Laboratory — mission 2011 concept artwork Operator NASA Major contractors Boeing Lockheed Martin …
44Mechanical calculator — An old Russian mechanical calculator. A mechanical calculator is a device used to perform the basic operations of arithmetic. Mechanical calculators are comparable in size to small desktop computers and have been rendered obsolete by the advent… …
45Moon landing — For other uses, see Moon landing (disambiguation). Still frame from the video transmission of Neil Armstrong stepping onto the surface of the Moon at 02:56 UTC on 21 July 1969. An estimated 500 million people worldwide watched this event,… …
46NASA Pathfinder — Helios Prototype Helios Prototype in flight Role Remote controlled UAV Manufacturer …
47Turboglide — The Turboglide is a Chevrolet three speed automatic transmission that made its debut as an optional transmission on Chevrolet V8 passenger cars for 1957. It consisted of a concurrently geared (as opposed to sequentially) planetary gearbox with a… …
48Electric boat — This article is about electrically powered boats in general. For the company called Electric Boat , see General Dynamics Electric Boat. Passenger solar boat Solifleur, Switzerland 1995 While a significant majority of water vessels are powered by… …
49Churchill tank — Tank, Infantry, Mk IV (A22) Tank, Infantry Mk IV Churchill IV (75mm) Type Infantry tank Place of origin …
50Contra-rotating propellers — For contra rotating marine propellors, helicopter rotors and turbine fan blades, see Contra rotating. Not to be confused with counter rotating propellers. Contra rotating propellers on a Rolls Royce–Griffon–powered P 51 unlimited racer Aircraft… …
