Engineering and Machinery

• Rotary motion
• Rotary engine
  Rotary engine
  The rotary engine was an early type of internal-combustion engine, usually designed with an odd number of cylinders per row in a radial configuration, in which the crankshaft remained stationary and the entire cylinder block rotated around it...
  
  , a type of internal combustion engine from the early 20th century
• Rotary engine (disambiguation)
  Rotary engine (disambiguation)
  A rotary engine is a type of internal combustion piston engine used in some early aircraft, motorcycles, and cars. Virtually the whole engine rotates about a fixed crankshaft.Rotary engine may also refer to:...
  
  , other engines called "rotary"
  • Wankel engine
    Wankel engine
    The Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. Its four-stroke cycle takes place in a space between the inside of an oval-like epitrochoid-shaped housing and a rotor that...
    
    
• Rotary latch
• Rotary milking shed, a type of milking shed used in the dairy
  Dairy
  A dairy is a business enterprise established for the harvesting of animal milk—mostly from cows or goats, but also from buffalo, sheep, horses or camels —for human consumption. A dairy is typically located on a dedicated dairy farm or section of a multi-purpose farm that is concerned...
  
   industry
• Rotary snowplow
  Rotary snowplow
  A rotary snowplow is a piece of railroad snowfighting equipment. It is characterized by the large circular set of blades on its front end that rotate as a unit to cut through the snow on the track ahead of it.-History:...
  
  , one type of railroad snowplow used especially for deep snow removal
• Rotary table (drilling rig)
  Rotary table (drilling rig)
  A rotary table is a mechanical device on a drilling rig that provides clockwise rotational force to the drill string to facilitate the process of drilling a borehole.In the diagram, #20 is the rotary table...
  
  , a device used to apply directional force to a drill string
• Rotary tiller, a motorised cultivator
• Rotary woofer
  Rotary Woofer
  The Rotary Woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change the pitch of a set of fan blades rotating at a constant speed...
  
  , a type of loudspeaker capable of producing very low frequency sound
• Rotary wing aircraft

Telecommunications

• Rotary dial
  Rotary dial
  The rotary dial is a device mounted on or in a telephone or switchboard that is designed to send electrical pulses, known as pulse dialing, corresponding to the number dialed. The early form of the rotary dial used lugs on a finger plate instead of holes. Almon Brown Strowger filed the first patent...
  
  , a rotating telephone dial
• Rotary system, a type of pre-electronic telephone switch

Companies

• Rotary International
  Rotary International
  Rotary International is an organization of service clubs known as Rotary Clubs located all over the world. The stated purpose of the organization is to bring together business and professional leaders to provide humanitarian service, encourage high ethical standards in all vocations, and help...
  
  , or Rotary Club, a service organization
  • Rotary Foundation
    Rotary Foundation
    The Rotary Foundation is a not-for-profit corporation that supports the efforts of Rotary International to achieve world understanding and peace through international humanitarian, educational, and cultural exchange programs...
    
    , non-profit foundation of Rotary International
• Rotary Watches
  Rotary Watches
  Rotary Watches Ltd was established at La Chaux-de-Fonds, Switzerland by Moise Dreyfuss in 1895. By the 1920s family members Georges and Sylvain Dreyfuss began importing Rotary watches to Britain, which was to become the company's most successful market...
  
  , a Swiss watchmaker