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2. List of vacuum cleaners - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_cleaners

   Vax Mach Air; Vax Airlift; Shark Rotator Series (NV3xx, NV4xx, NV5xx, NV6xx, NV7xx) Shark Apex Series (AZ1xxx) Shark Vertex Series (AZ2xxx) Vax Air Stretch; Vax Air Reach, Pet, Pets and Family, total home; Hoover Windtunnel Bagless

3. The Hoover Company - Wikipedia

   en.wikipedia.org/wiki/The_Hoover_Company

   The Hoover Company is a home appliance company founded in Ohio, United States, in 1908.It also established a major base in the United Kingdom, where it dominated the electric vacuum cleaner industry during most of the 20th century, to the point where the Hoover brand name became synonymous with vacuum cleaners and vacuuming in the United Kingdom and Ireland.

4. Vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Vacuum_cleaner

   Patent model of Daniel Hess's carpet sweeper. In 1860 a manual vacuum cleaner was invented by Daniel Hess of West Union, Iowa. Called a "carpet sweeper", it gathered dust with a rotating brush and had a bellows for generating suction. [4] [5] Another early model (1869) was the "Whirlwind", invented in Chicago in 1868 by Ives W. McGaffey. The ...

5. Wind tunnel - Wikipedia

   en.wikipedia.org/wiki/Wind_tunnel

   Wind tunnel test sections range in size from less than a foot across, to over 100 feet (30 m), and with air speeds from a light breeze to hypersonic. The earliest wind tunnels were invented towards the end of the 19th century, in the early days of aeronautical research, as part of the effort to develop heavier-than-air flying machines.

6. Supersonic wind tunnel - Wikipedia

   en.wikipedia.org/wiki/Supersonic_wind_tunnel

   Engineers check an aircraft model before a test run in the Supersonic Wind Tunnel at Lewis Flight Propulsion Laboratory. Schlieren photography is often used to capture images of gas flow and shock waves in supersonic wind tunnels. Here, Mach 4 flow over a pitot probe is observed by schlieren optics in the Penn State Supersonic Wind Tunnel. The ...