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  2. Rebar spacer - Wikipedia

    en.wikipedia.org/wiki/Rebar_spacer

    Rebar spacer. A concrete spacer with a plastic clip in use on the side of the formwork. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured and remain within the structure.

  3. Power dividers and directional couplers - Wikipedia

    en.wikipedia.org/wiki/Power_dividers_and...

    Hybrid ring coupler in planar format. The hybrid ring coupler, also called the rat-race coupler, is a four-port 3 dB directional coupler consisting of a 3λ/2 ring of transmission line with four lines at the intervals shown in figure 12. Power input at port 1 splits and travels both ways round the ring.

  4. Umbrella - Wikipedia

    en.wikipedia.org/wiki/Umbrella

    An umbrella or parasol is a folding canopy supported by wooden or metal ribs that is mounted on a wooden, metal, or plastic pole. It is usually designed to protect a person against rain. The term umbrella is traditionally used when protecting oneself from rain, while parasol is used when protecting oneself from sunlight, though the terms ...

  5. Concentric reducer - Wikipedia

    en.wikipedia.org/wiki/Concentric_reducer

    The concentric reducer is cone -shaped, and is used when there is a shift in diameter between pipes. [1] For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level. [2] This pipe reducer may be used when there is a single diameter change or multiple diameter changes.

  6. Umbrella antenna - Wikipedia

    en.wikipedia.org/wiki/Umbrella_antenna

    Umbrella antenna. An umbrella antenna is a capacitively top-loaded wire monopole antenna, consisting in most cases of a mast fed at the ground end, to which a number of radial wires are connected at the top, sloping downwards. [1] One side of the feedline supplying power from the transmitter is connected to the mast, and the other side to a ...

  7. Hirth joint - Wikipedia

    en.wikipedia.org/wiki/Hirth_joint

    Hirth joint (disassembled) between the semi-axles of a Campagnolo Ultra-Torque crankset. A Hirth joint or Hirth coupling is a type of mechanical connection named after its developer Albert Hirth. It is used to connect two pieces of a shaft together and is characterized by tapered teeth that mesh together on the end faces of each half shaft.

  8. Umbrella (song) - Wikipedia

    en.wikipedia.org/wiki/Umbrella_(song)

    Music video. "Umbrella (Orange Version)" on YouTube. " Umbrella " is a song by Bajan singer Rihanna, released worldwide on March 29, 2007, through Def Jam Recordings as the lead single and opening track from her third studio album, Good Girl Gone Bad (2007). Its featured artist, American rapper Jay-Z, co-wrote the song with its producers Tricky ...

  9. The Lord of the Rings: The Rings of Power season 1 - Wikipedia

    en.wikipedia.org/wiki/The_Lord_of_the_Rings:_The...

    The first season of the American fantasy television series The Lord of the Rings: The Rings of Power is based on J. R. R. Tolkien 's history of Middle-earth, primarily material from the appendices of the novel The Lord of the Rings. Set thousands of years before the novel in the Second Age of Middle-earth, the season depicts the emergence of ...

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