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2. Gauge block - Wikipedia

   en.wikipedia.org/wiki/Gauge_block

   Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness.

3. Tramway track - Wikipedia

   en.wikipedia.org/wiki/Tramway_track

   Block rail is a lower profile form of girder guard rail, where the web is eliminated. In profile it is more like a solid form of bridge rail with a flangeway and guard added. Simply removing the web and combining the head section directly with the foot section would result in a weak rail, so additional thickness is required in the combined section.

4. List of steepest gradients on adhesion railways - Wikipedia

   en.wikipedia.org/wiki/List_of_steepest_gradients...

   1 in 11.4 (8.8%) Cinci Drumuri–Pădurii, Iași Tramways, Iași, Romania [5] 1 in 11.4 (8.75%) A and B Loop and NS Line of the Portland Streetcar system, Portland, Oregon, United States Located in the block of Southwest Harrison Street between 1st Avenue and 2nd Avenue [6] 1 in 11.8 (8.5%) Stuttgart light rail system, Germany

5. Surface plate - Wikipedia

   en.wikipedia.org/wiki/Surface_plate

   A common problem is wear to particular areas, such as that caused by the frequent use of a tool in one place (such as a height gauge), that causes an uneven surface and reduces overall accuracy of the plate, this may be greatly accelerated if abrasive dust is present. Tools and workpieces may also cause damage when dropped on the surface plate.

6. Machinist square - Wikipedia

   en.wikipedia.org/wiki/Machinist_square

   Simple method for checking a low grade square against itself. The simplest method of checking a low grade square for accuracy is to draw a line across a board with a flat face and straight edge (illustrated). Then flip the square over 180 degrees and check if the blade aligns with the line just drawn.

7. images.huffingtonpost.com

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