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  2. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    A line level is a level designed to hang on a builder's string line. The body of the level incorporates small hooks to allow it to attach and hang from the string line. The body is lightweight, so as not to weigh down the string line, it is also small in size as the string line in effect becomes the body; when the level is hung in the center of ...

  3. Tape dispenser - Wikipedia

    en.wikipedia.org/wiki/Tape_dispenser

    A small tape dispenser box sealing tape being applied with a roll-on tape dispenser. A tape dispenser is an object that holds a roll of tape and has a mechanism at one end to shear the tape. Dispensers vary widely based on the tape they dispense. Abundant and most common, clear tape dispensers (like those used in an office or at home) are ...

  4. 61 cm Type 90 torpedo - Wikipedia

    en.wikipedia.org/wiki/61_cm_Type_90_torpedo

    The torpedo was based on a newly developed British 46-knot (85 km/h) 21-inch (53 cm) Whitehead torpedo. This weapon used a new double-action two-cylinder engine rather than the four-cylinder radial engine used by World War I-era British torpedoes. It was significantly faster (8–10 knots (15–19 km/h)), although it had a much shorter range ...

  5. Thread seal tape - Wikipedia

    en.wikipedia.org/wiki/Thread_seal_tape

    Thread seal tape is wrapped around the threads, lubricating the connection and allowing the two pieces to be screwed deeper together. Thread seal tape (also known as PTFE tape, Teflon tape, or plumber's tape) is a polytetrafluoroethylene (PTFE) film tape commonly used in plumbing for sealing pipe threads. The tape is sold cut to specific widths ...

  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. Water level (device) - Wikipedia

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

    The water level at each end of the tube will be at the same elevation, whether the two ends are adjacent or far apart, so a line between them will be horizontal at its midpoint and a shed base, building foundation or similar structure laid out using several such lines will be "horizontal" within building tolerances on any scale over which use ...

  8. Pendulum-and-hydrostat control - Wikipedia

    en.wikipedia.org/wiki/Pendulum-and-hydrostat_control

    However, with only a hydrostat controlling the depth fins in a negative feedback loop, the torpedo tends to oscillate around the desired depth rather than settling to the desired depth. The addition of a pendulum allows the torpedo to sense the pitch of the torpedo. The pitch information is combined with the depth information to set the torpedo ...

  9. Japanese 45 cm torpedo - Wikipedia

    en.wikipedia.org/wiki/Japanese_45_cm_torpedo

    The Type 44 No.2 Mod 1 was an aerial torpedo variant used on aircraft, such as the B1M, B2M, and B3Y biplane torpedo bombers. Prototype testing commenced in 1923 and the weapon was approved for service in 1924, for use on Japan's first aircraft carrier, the Hosho .

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