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  2. Screw piles - Wikipedia

    en.wikipedia.org/wiki/Screw_piles

    Screw foundations first appeared in the 1800s as pile foundations for lighthouses, [4] and were extensively used for piers in harbours. Between the 1850s through 1890s, more than 100 screw-pile lighthouses were erected on the east coast of the United States using screw piles. Made originally from cast or wrought iron, they had limited bearing ...

  3. List of burial mounds in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_burial_mounds_in...

    An Early Marksville culture site located near Port Gibson in Claiborne County, Mississippi, on a bluff 1 mile (1.6 km) east of the Mississippi River, 2 miles (3.2 km) north of the mouth of the Big Black River. [7] The site has an extant burial mound, and may have possibly had two others in the past. The site is believed to have been occupied ...

  4. Screw-pile lighthouse - Wikipedia

    en.wikipedia.org/wiki/Screw-pile_lighthouse

    Fowey Rocks Light, near Key Biscayne, Florida Spit Bank Lighthouse , in Cork Harbour , Ireland was built by Alexander Mitchell between 1851 and 1853 and is still in use. Carysfort Reef Light , four miles east of Key Largo , Florida , was built in 1852 and was the oldest screw-pile (with disk) lighthouse still in service in the United States ...

  5. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper .

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    The term fine adjustment screw typically refers to screws with threads from 40–100 TPI (Threads Per Inch) (0.5 mm to 0.2 mm pitch) and ultra fine adjustment screw has been used to refer to 100–254 TPI (0.2 mm to 0.1 mm pitch). These screws are most frequently used in applications where the screw is used to control fine motion of an object.

  8. List of sinkholes - Wikipedia

    en.wikipedia.org/wiki/List_of_sinkholes

    The Great Blue Hole, a giant submarine sinkhole, near Ambergris Caye, Belize The following is a list of sinkholes , blue holes , dolines , crown holes , cenotes , and pit caves . A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.

  9. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    The ground tab is designed to be attached to the outlet faceplate screw, which is supposed to be connected to the building electrical ground. A cheater plug, AC ground lifter or three-prong/two-prong adapter is an adapter that allows a NEMA 5-15P grounding-type plug (three prongs) to connect to a NEMA 1-15R non-grounding receptacle (two slots).

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