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  2. Anglepoise lamp - Wikipedia

    en.wikipedia.org/wiki/Anglepoise_lamp

    A key feature of the Anglepoise design and patent is the placement of all springs (either three or four) near the base. [13] The design was extensively copied by other companies, usually in simplified form, and is still in use. Some derivatives use a heavy balance weight instead of the springs.

  3. Nightstand - Wikipedia

    en.wikipedia.org/wiki/Nightstand

    A nightstand, [1] alternatively night table, bedside table, daystand or bedside cabinet, is a small table or cabinet designed to stand beside a bed or elsewhere in a bedroom. Modern nightstands are usually small bedside tables, often with one or sometimes more drawers and/or shelves and less commonly with a small door. They are often used to ...

  4. Bi-pin lamp base - Wikipedia

    en.wikipedia.org/wiki/Bi-pin_lamp_base

    The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...

  5. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    The ultra-high-energy cosmic ray observed in 1991 had a measured energy of about 50 J, equivalent to about 2.5 × 10 −8 E P. [46] [47] Proposals for theories of doubly special relativity posit that, in addition to the speed of light, an energy scale is also invariant for all inertial observers. Typically, this energy scale is chosen to be the ...

  6. Compass rose - Wikipedia

    en.wikipedia.org/wiki/Compass_rose

    Also notice the correspondence between the 32-point rose (inner circle) and the modern 0–360° graduations. Compass rose with the eight principal winds . A compass rose or compass star , sometimes called a wind rose or rose of the winds , is a polar diagram displaying the orientation of the cardinal directions ( north , east , south , and ...

  7. Lithium - Wikipedia

    en.wikipedia.org/wiki/Lithium

    2) when burnt in O 2, salts with similar solubilities, and thermal instability of the carbonates and nitrides. [48] [100] The metal reacts with hydrogen gas at high temperatures to produce lithium hydride (LiH). [101] Lithium forms a variety of binary and ternary materials by direct reaction with the main group elements.