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2. Hand fan - Wikipedia

   en.wikipedia.org/wiki/Hand_fan

   Handheld Brise fan from 1800. A handheld fan, or simply hand fan, is a broad, flat surface that is waved back-and-forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.

3. European hand fans in the 18th century - Wikipedia

   en.wikipedia.org/wiki/European_hand_fans_in_the...

   Hand fans first arrived in Europe in the 15th century from Asia and became popular in the 16th century. Several fan styles were common and a plethora of materials were used to create them. Subject matter varied greatly, from Biblical scenes to landscapes. Hand fans serve as a cooling mechanism, social instrument, and fashion accessory.

4. Propfan - Wikipedia

   en.wikipedia.org/wiki/Propfan

   One of the earliest engines that resembled the propfan concept was the 4,710 pounds-force (21.0 kilonewtons) Metrovick F.5, which featured twin contra-rotating fans—14 blades in the fore (front) fan and 12 blades in the aft (back) fan—at the rear of the engine and was first run in 1946.

5. Titanium - Wikipedia

   en.wikipedia.org/wiki/Titanium

   The processing of titanium metal occurs in four major steps: reduction of titanium ore into "sponge", a porous form; melting of sponge, or sponge plus a master alloy to form an ingot; primary fabrication, where an ingot is converted into general mill products such as billet, bar, plate, sheet, strip, and tube; and secondary fabrication of ...

6. Fan Museum - Wikipedia

   en.wikipedia.org/wiki/Fan_Museum

   The Fan Museum, which opened in 1991, is the world's first museum dedicated to the preservation and display of hand fans. [1] It is located within two grade II* listed houses that were built in 1721 within the Greenwich World Heritage Site on Croom's Hill in southeast London , England. [ 2 ]

7. Forget Gold: Titanium Will Be the Metal With the Midas Touch

   www.aol.com/news/2012-06-12-titanium-beats-gold...

   This time around, with inventory stashed away and 2 billion tons of titanium available worldwide, there's less concern over supply, and the versatility of the metal will protect its position in ...