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  • slide rule

    Simple mechanical device used for calculations such as multiplication and division.

  • slinger

    A chain and harness device used for unloading objects

  • smallpox

    Smallpox is an infectious virus unique to humans. It results in a characteristic skin rash and fluid-filled blisters. After successful vaccination campaigns throughout the 1800s and 1900s, the World Health Organisation certified the eradication of smallpox in 1979. Smallpox is the only human infectious disease to have been completely wiped out.

  • smelling salts

    Used to arouse consciousness. The salts release a small amount of ammonia, which triggers the nasal passage's inhalation reflex.

  • smoke tube

    One of the horizontal pipes carrying smoke and burning gases from the firebox to the smokebox, heating the boiler water which surrounds them and thus producing the steam.

  • smoking

    A practice where a substance, most commonly tobacco is burned and the smoke inhaled. It is currently practiced by over one billion people worldwide (2008)

  • Snellen test types

    Chart used for vision testing. The chart shows lines of black letters varying in size from large to small down the chart. Which a patient is asked to read. The optician is able to tell the level of the patient's eyesight when s/he can not read any further.

  • snow plough (vehicle)

    A special vehicle propelled by one or more locomotives to remove snow from the railway.

  • snuff

    Tobacco that has been finely powdered. Snuff is usually sniffed through the nose, or applied to the gums with a finger.

  • snuff box

    a small usually ornamental container for holding snuff Boxes, usually having a hinged lid and small enough to be carried in the pocket, used for holding snuff

  • snuff jar

    a box or jar used for holding snuff, usually small enough to be carried in the pocket.

  • sofa

    A long upholstered seat typically with a back and arms.

  • software

    Computer system program, procedures, and associated documentation concerned with the operation of data processing systems, and which require hardware for use to be made of them. For individual collections or sequences of code provided by a user to perform a particular task, use 'programs'. For programs that serve a particular purpose and that may be packaged and sold by a manufacturer use 'applications'.


    A method used to detect objects underwater by sending high frequency sound waves and monitoring their reflection.

  • song

    Musical compositions, generally short, containing words. Colloquially, the term song has come to be applied to any short compositions with or without words. This is considered incorrect in the genres of jazz, brass band, classical and popular music.

  • sorting tender

    A railway vehicle designed for the carriage of mail and providing facilities for sorting whilst in transit.

  • sound-level meter

    Instrument designed to measure noise and sound levels, usually consisting of microphone, amplifier, output meter, and frequency-weighting apparatus.

  • soup plate

    Plates intended primarily for serving an individual portion of soup, having a shallow well and usually a wide rim.

  • soup spoon

    Spoons with circular or oval bowls, used to consume soup and similar foods, especially when served from soup plates. For similar but smaller spoons with a rounded bowl and used to consume bouillon or clear soup, use "bouillon spoons."

  • soup tureen

    Large, covered tureens intended primarily for serving soup. Generally rests on a spreading foot or on three or four short legs, and is sometimes accompanied by a stand.

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