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2. List of unusual units of measurement - Wikipedia

   en.wikipedia.org/wiki/List_of_unusual_units_of...

   A board foot is a United States and Canadian unit of approximate volume, used for lumber. It is equivalent to 1 inch × 1 foot × 1 foot (144 cu in or 2,360 cm 3). It is also found in the unit of density pounds per board foot. In Australia and New Zealand the terms super foot or superficial foot were formerly used for this unit. The exact ...

3. Tiangong Kaiwu - Wikipedia

   en.wikipedia.org/wiki/Tiangong_Kaiwu

   It featured detailed illustrations that were valuable for historians in understanding many early Chinese production processes. For example, illustrations for brick-making; one shows a kilnmaster checking the temperature of a furnace while an assistant stands by and douses the kiln to induce superficial glazing; [5] another illustration shows a brick-maker filling a wooden mold with clay while ...

4. Dental drill - Wikipedia

   en.wikipedia.org/wiki/Dental_drill

   Air turbine used in a dental handpiece Correlation between rotational speed and torque Correlation between rotational speed and turbine output power. The turbine is powered by compressed air between 35 and 61 pounds per square inch (~2,4 to 4,2 bar), [1] [2] which passes up the centre of the instrument and rotates a Pelton wheel in the head of the handpiece.

5. List of gear nomenclature - Wikipedia

   en.wikipedia.org/wiki/List_of_gear_nomenclature

   Tooth-to-tooth radial composite deviation (double flank) is the greatest change in center distance while the gear being tested is rotated through any angle of 360 degree/z during double flank composite action test. Tooth-to-tooth radial composite tolerance (double flank) is the permissible amount of tooth-to-tooth radial composite deviation.

6. Bucket (machine part) - Wikipedia

   en.wikipedia.org/wiki/Bucket_(machine_part)

   Subsets of the excavator bucket are: the ditching bucket, trenching bucket, A ditching bucket is a wider bucket with no teeth, 5–6 feet (1.52–1.83 m) used for excavating larger excavations and grading stone. A trenching excavator bucket is normally 6 to 24 in (152 to 610 mm) wide and with protruding teeth.

7. Lingual braces - Wikipedia

   en.wikipedia.org/wiki/Lingual_braces

   They involve attaching the orthodontic brackets on the inner (lingual vs. buccal) sides of the teeth. The main advantage of lingual braces is their near invisibility [ 1 ] compared to the standard braces, which are attached on the buccal (cheek) sides of the tooth . [ 2 ]