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2. Billiard table - Wikipedia

   en.wikipedia.org/wiki/Billiard_table

   The standard on American pool tables is the K-66 profile, which as defined by the Billiard Congress of America (BCA) has a base of 1 + 3 ⁄ 16 inches (30 mm) and a nose height of 1 inch (25 mm). [3] When installed properly the distance from the nose of the cushion to the covered slate surface is 1 + 7 ⁄ 16 inches (37 mm) [ 4 ] while using a ...

3. List of scale model sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_scale_model_sizes

   1:43.5: 7.02 mm: Model railways (0) Exact O scale of 7 mm = 1 foot. 1:43: 7.088 mm: Die-cast cars: Still the most popular scale for die-cast cars worldwide, metric or otherwise. It originates from British O scale. 1:40: 0.3 in: 7.620 mm The very early models of the British Coronation Coach and a few other horse-drawn wagons were made in this scale.

4. Ring size - Wikipedia

   en.wikipedia.org/wiki/Ring_size

   In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1 ⁄ 4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.

5. Brilliant (diamond cut) - Wikipedia

   en.wikipedia.org/wiki/Brilliant_(diamond_cut)

   [8] Figures 1 and 2 show the facets of a round brilliant diamond. Figure 1 assumes that the "thick part of the girdle" is the same thickness at all 16 "thick parts". It does not consider the effects of indexed upper girdle facets. Figure 2 is adapted from Figure 37 of Marcel Tolkowsky's Diamond Design, [9] which was originally published in 1919 ...

6. Princess cut - Wikipedia

   en.wikipedia.org/wiki/Princess_cut

   Princess cut diamond set in a ring. The princess cut (technical name 'square modified brilliant') is a diamond cut shape often used in engagement rings. The name dates back to the 1960s, while the princess cut as it exists was created by Betazel Ambar, Ygal Perlman, and Israel Itzkowitz in 1980.

7. British Association screw threads - Wikipedia

   en.wikipedia.org/wiki/British_Association_screw...

   The design was first proposed by the British Association in 1884 [1] [2] with a thread angle and depth based on the Swiss Thury thread, [3] it was adopted by the Association in 1903. The Thury thread was different in that it went both positive and negative all the way up to a size of −20 which was 75.2 mm diameter by 8.23 mm pitch (p). The ...

8. Royal Asscher Diamond Company - Wikipedia

   en.wikipedia.org/wiki/Royal_Asscher_Diamond_Company

   Non-round shapes used to be harder to find and purchase as there is no universal cut grading system for fancy shapes, whereas round diamond shapes have the ideal category (as best in cut class). Seeking to create a new level of perfection in this class, Royal Asscher debuted four cuts, each cut with 16 more facets compared to generic counterparts.

9. Lozenge (shape) - Wikipedia

   en.wikipedia.org/wiki/Lozenge_(shape)

   The lozenge shape is often used in parquetry (with acute angles that are 360°/n with n being an integer higher than 4, because they can be used to form a set of tiles of the same shape and size, reusable to cover the plane in various geometric patterns as the result of a tiling process called tessellation in mathematics) and as decoration on ...