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  2. Loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker

    The term loudspeaker may refer to individual transducers (also known as drivers) or to complete speaker systems consisting of an enclosure and one or more drivers.. To adequately and accurately reproduce a wide range of frequencies with even coverage, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level (SPL) or maximum accuracy.

  3. Sonar - Wikipedia

    en.wikipedia.org/wiki/Sonar

    The Type 91, with 30 inch quartz projector, worked at 9 kHz. The Type 93, with smaller quartz projectors, operated at 17.5 kHz (model 5 at 16 or 19 kHz magnetostrictive) at powers between 1.7 and 2.5 kilowatts, with range of up to 6 km.

  4. Kamaran - Wikipedia

    en.wikipedia.org/wiki/Kamaran

    Kamaran Island had an Ottoman post office until 1915 and had a sub-post office of Aden beginning in 1924. From 1967, it was a postal territory of South Yemen , from 1972 of North Yemen , and from 1990 of the unified Republic of Yemen .

  5. Machine taper - Wikipedia

    en.wikipedia.org/wiki/Machine_taper

    The rate of taper is 1:20 on diameter, in other words 0.600" on diameter per foot, .050" on diameter per inch. Tapers range from a Number 2 to a Number 20. The diameter of the big end in inches is always the taper size divided by 8, the small end is always the taper size divided by 10 and the length is the taper size divided by 2.

  6. Pearl millet - Wikipedia

    en.wikipedia.org/wiki/Pearl_millet

    Pearl millet (Cenchrus americanus, commonly known as the synonym Pennisetum glaucum) is the most widely grown type of millet.It has been grown in Africa and the Indian subcontinent since prehistoric times.

  7. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space.