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2. Stage lighting instrument - Wikipedia

   en.wikipedia.org/wiki/Stage_lighting_instrument

   All PAR lamps except those with narrow or very narrow lenses produce an intense oval pool of light, some with fixed focus and soft edges. [7] In order to adjust the orientation of the oval, the lamp must be rotated. [8] The number associated with a PAR light (e.g.: Par 64, Par 36, Par 16) indicates the diameter of the lamp in eighths of an inch ...

3. Parabolic aluminized reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_aluminized_reflector

   For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1] The size of rectangular PAR lamps is expressed as the letters REC followed by the reflector's mouth height, the letter "X", and the reflector's mouth width—with both dimensions in millimeters. For example, REC142X200 lamps are 142 high and 200 mm wide. [2] [3]

4. Mains electricity - Wikipedia

   en.wikipedia.org/wiki/Mains_electricity

   A 50 Hz ±5 Hz vibrating-reed mains frequency meter for 220 V. The world's first public electricity supply was a water wheel driven system constructed in the small English town of Godalming in 1881. It was an alternating current (AC) system using a Siemens alternator supplying power for both street lights and consumers at two voltages, 250 V ...

5. 7.5 cm kanon PL vz. 37 - Wikipedia

   en.wikipedia.org/wiki/7.5_cm_kanon_PL_vz._37

   The 7.5 cm kanon PL vz. 37 (Anti-aircraft Gun Model 37) was a Czech anti-aircraft gun used in World War II.Those weapons captured after the German occupation of Czechoslovakia in March 1939 were taken into Wehrmacht service as the 7.5 cm Flak M 37(t) or Flak Skoda.

6. List of United States records in masters athletics - Wikipedia

   en.wikipedia.org/wiki/List_of_United_States...

   These are the current records in the various age groups of masters athletics for United States competitors. Starting at age 35, each age group starts on the athlete's birthday in years that are evenly divisible by 5 and extends until the next such occurrence.

7. Halo antenna - Wikipedia

   en.wikipedia.org/wiki/Halo_antenna

   A halo antenna, or halo, is a center-fed ⁠ 1 / 2 ⁠ wavelength dipole antenna, which has been bent into a circle, with a break directly opposite the feed point. The dipole's ends are close, but do not touch, and the ends on either side of the gap may be flared out to form a larger air gap capacitor , whose spacing is used to fine-adjust the ...