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  2. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    A tubular spirit level A bull's eye spirit level mounted in a camera tripod. A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical . Two basic designs exist: tubular (or linear) and bull's eye (or circular).

  3. Level (optical instrument) - Wikipedia

    en.wikipedia.org/wiki/Level_(optical_instrument)

    The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...

  4. Water level (device) - Wikipedia

    en.wikipedia.org/wiki/Water_level_(device)

    A water level device showing both ends at the same height. A water level (Greek: Aλφαδολάστιχο or (υδροστάθμη) [Alfadolasticho]) is a siphon utilizing two or more parts of the liquid water surface to establish a local horizontal line or plane of reference.

  5. Japanese 32 cm torpedo - Wikipedia

    en.wikipedia.org/wiki/Japanese_32_cm_torpedo

    The newer Type 12 torpedo is based on the Type 97 torpedo body and shares numerous elements of its construction. Thus, as of 2024, the Type 97 is being gradually decommissioned, with parts being salvaged for production of new Type 12 units. [citation needed] Specifications: [19] Entered service: 1997

  6. Plumb bob - Wikipedia

    en.wikipedia.org/wiki/Plumb_bob

    A plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical direction as a reference line, or plumb-line. It is a precursor to the spirit level and used to establish a vertical datum. It is typically made of stone, wood, or lead, but can also be made of other ...

  7. Japanese 45 cm torpedo - Wikipedia

    en.wikipedia.org/wiki/Japanese_45_cm_torpedo

    Torpedo work at the Kasumigaura air field continued until January 1923, which is when a final torpedo design without an explosive payload was tested on the new Mitsubishi B1M bomber, and finally implemented with a warhead the same year. The torpedo thus used was a modification of the Type 44, which lasted until 1931, whereupon it was gradually ...

  8. High-test peroxide - Wikipedia

    en.wikipedia.org/wiki/High-test_peroxide

    The first Russian HTP torpedo was known by the strictly functional name of 53-57, the 53 referring to the diameter in centimeters of the torpedo tube, the 57 to the year it was introduced. Driven by the Cold War competition, they ordered the development of a larger HTP torpedo, to be fired from the 65-centimeter (26-inch) tubes.

  9. Bull's eye level - Wikipedia

    en.wikipedia.org/wiki/Bull's_eye_level

    A bull's eye level showing a level position A bull's eye level showing an unlevel position Machinist bulls-eye level. A bull's eye level is a type of spirit level that allows for the leveling of planes in two dimensions — both the 'pitch' and 'roll' in nautical terms. Standard tubular levels only consider one dimension.

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