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  2. Wilden Ironworks - Wikipedia

    en.wikipedia.org/wiki/Wilden_Ironworks

    He is described as businessman and merchant. It was chiefly used to carry timber to a steam saw-mill in Wilden. Later it was used to transport coal and iron to the Wilden Works. There were two houses at Pratt's Wharf, one occupied by a lock keeper and the other by a clerk. The link was closed c1950. [1]

  3. Slotted angle - Wikipedia

    en.wikipedia.org/wiki/Slotted_angle

    Slotted angle (also sometimes referred to as slotted angle iron) is a system of reusable metal strips used to construct shelving, frames, work benches, equipment stands and other structures. The name derives, first, from the use of elongated slots punched into the metal at uniform intervals to enable assembly of structures fixed with nuts and ...

  4. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  5. Angle grinder - Wikipedia

    en.wikipedia.org/wiki/Angle_grinder

    An angle grinder, also known as a side grinder or disc grinder, is a handheld power tool used for grinding (abrasive cutting) and polishing. Although developed originally as tools for rigid abrasive discs, the availability of an interchangeable power source has encouraged their use with a wide variety of cutters and attachments.

  6. Tangent half-angle substitution - Wikipedia

    en.wikipedia.org/wiki/Tangent_half-angle...

    As t goes from 0 to 1, the point follows the part of the circle in the first quadrant from (1, 0) to (0, 1). Finally, as t goes from 1 to +∞, the point follows the part of the circle in the second quadrant from (0, 1) to (−1, 0). Here is another geometric point of view. Draw the unit circle, and let P be the point (−1, 0).

  7. Wrought Iron Bridge Company - Wikipedia

    en.wikipedia.org/wiki/Wrought_Iron_Bridge_Company

    The Wrought Iron Bridge Company was a bridge fabrication and construction company based in Canton, Ohio, United States. It specialized in the fabrication of iron truss bridges and was a prolific bridge builder in the late 19th century. It was one of the 28 firms consolidated by J. P. Morgan into the American Bridge Company in 1900. [1]

  8. Angle bracket (fastener) - Wikipedia

    en.wikipedia.org/wiki/Angle_bracket_(fastener)

    An angle bracket or angle brace or angle cleat is an L-shaped fastener used to join two parts generally at a 90-degree angle. It is typically made of metal but it can also be made of wood or plastic. Angle brackets feature holes in them for screws. A typical example use of is a shelf bracket for mounting a shelf on a wall.

  9. Dihedral angle - Wikipedia

    en.wikipedia.org/wiki/Dihedral_angle

    If the points are sequentially numbered and located at positions r 1, r 2, r 3, etc. then bond vectors are defined by u 1 = r 2 − r 1, u 2 = r 3 − r 2, and u i = r i+1 − r i, more generally. [2] This is the case for kinematic chains or amino acids in a protein structure. In these cases, one is often interested in the half-planes defined ...

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