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  2. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate

  3. IP code - Wikipedia

    en.wikipedia.org/wiki/IP_Code

    The IP code or ingress protection code indicates how well a device is protected against water and dust. It is defined by the International Electrotechnical Commission (IEC) under the international standard IEC 60529 [1] which classifies and provides a guideline to the degree of protection provided by mechanical casings and electrical enclosures ...

  4. 68-pounder gun - Wikipedia

    en.wikipedia.org/wiki/68-pounder_gun

    The 68-pounder cannon was an artillery piece designed and used by the British Armed Forces in the mid-19th century. The cannon was a smoothbore muzzle-loading gun manufactured in several weights, the most common being 95 long cwt (4,800 kg), and fired projectiles of 68 lb (31 kg). Colonel William Dundas designed the 112 cwt version in 1841 [2 ...

  5. List of U.S. security clearance terms - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._security...

    T3 or T3R - Tier 3 or Tier 3 Reinvestigation, now replace all NACLC. T5 and T5R - Tier 5 or Tier 5 Reinvestigation, now replace SSBI and SBPR respectively. Yankee White – An investigation required for personnel working with the President and Vice President of the United States. Obtaining such clearance requires, in part, an SSBI.

  6. Tomahawk (missile) - Wikipedia

    en.wikipedia.org/wiki/Tomahawk_(missile)

    Torpedo tubes. Surface ships. Submarines. TELs. The Tomahawk ( / ˈtɒməhɔːk /) Land Attack Missile ( TLAM) is a long-range, all-weather, jet-powered, subsonic cruise missile that is primarily used by the United States Navy and Royal Navy in ship and submarine-based land-attack operations. Developed at the Applied Physics Laboratory of Johns ...

  7. List of Internet top-level domains - Wikipedia

    en.wikipedia.org/wiki/List_of_Internet_top-level...

    This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet.A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database.

  8. Bermuda sloop - Wikipedia

    en.wikipedia.org/wiki/Bermuda_sloop

    Bermuda sloops at anchor and under sail. The Bermuda sloop is a historical type of fore-and-aft rigged single-masted sailing vessel developed on the islands of Bermuda in the 17th century. Such vessels originally had gaff rigs with quadrilateral sails, but evolved to use the Bermuda rig with triangular sails. Although the Bermuda sloop is often ...

  9. 24-pounder long gun - Wikipedia

    en.wikipedia.org/wiki/24-pounder_long_gun

    12 gunners and one powder-boy. Shell weight. 11.7 kg. Calibre. 152.2 mm [1] The 24-pounder long gun was a heavy calibre piece of artillery mounted on warships of the Age of Sail. 24-pounders were in service in the navies of France, Spain, Great Britain, the Netherlands, Sweden, and the United States.