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  2. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    Other features share the same characteristic. For example, if the drawing shows 8 holes on a bolt circle, and just one is dimensioned, with "TYP" or "(TYP)" following the dimension label, it means that that hole is typical of all 8 holes; in other words, it means that the other 7 holes are that size also.

  3. T-square - Wikipedia

    en.wikipedia.org/wiki/T-square

    For example, drywall T-squares are typically made of aluminum and have a 48-inch-long (120 cm) tongue, allowing them to be used for measuring and cutting drywall. In woodworking, higher-end table saws often have T-square fences attached to a rail on the front side of the table, providing improved accuracy and precision when cutting wood.

  4. Drop (liquid) - Wikipedia

    en.wikipedia.org/wiki/Drop_(liquid)

    A droplet with a diameter of 3 mm has a terminal velocity of approximately 8 m/s. [5] Drops smaller than 1 mm in diameter will attain 95% of their terminal velocity within 2 m. But above this size the distance to get to terminal velocity increases sharply. An example is a drop with a diameter of 2 mm that may achieve this at 5.6 m. [5]

  5. Surface tension - Wikipedia

    en.wikipedia.org/wiki/Surface_tension

    The puddle will spread out only to the point where it is a little under half a centimetre thick, and no thinner. Again this is due to the action of mercury's strong surface tension. The liquid mass flattens out because that brings as much of the mercury to as low a level as possible, but the surface tension, at the same time, is acting to ...

  6. Borehole - Wikipedia

    en.wikipedia.org/wiki/Borehole

    This includes holes advanced to collect soil samples, water samples or rock cores, to advance in situ sampling equipment, or to install monitoring wells or piezometers. Samples collected from boreholes are often tested in a laboratory to determine their physical properties, or to assess levels of various chemical constituents or contaminants.

  7. Selective dorsal rhizotomy - Wikipedia

    en.wikipedia.org/wiki/Selective_dorsal_rhizotomy

    Selective dorsal rhizotomy (SDR), less often referred to as selective posterior rhizotomy (SPR), is the most widely used form of rhizotomy, and is today a primary treatment for spastic diplegia, best done in the youngest years before bone and joint deformities from the pull of spasticity take place.

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