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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   The theft of manhole covers often increases when scrap metal prices are high. [18] [19] Manhole cover theft can be a serious problem in China, where missing manhole covers caused at least eight deaths in 2004. [20] According to China's Xinhua News Agency, about "240,000 manhole and street-drain covers were stolen in Beijing in 2004." [21]

3. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   A sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...

4. Shaft (civil engineering) - Wikipedia

   en.wikipedia.org/wiki/Shaft_(civil_engineering)

   Shafts are often entered through a manhole and closed by a manhole cover. They are constructed for a number of reasons including: For the construction of a tunnel; For ventilation of a tunnel or underground structure, aka ventilation shaft; As a drop shaft for a sewerage or water tunnel

5. Manhole - Wikipedia

   en.wikipedia.org/wiki/Manhole

   [15] [16] According to design standards, the distance between two manholes is typically between 7 and 20 meters, depending on the specific characteristics of the project. [17] [18] In cities, the distance is 20 meters per manhole, [19] while in industrial or commercial settings it is 10-15 meters per manhole.

6. Grade (slope) - Wikipedia

   en.wikipedia.org/wiki/Grade_(slope)

   This is commonly used in Europe to denote the incline of a railway. It is sometimes written as mm/m or m/km instead of the ‰ symbol. [1] [2] as a ratio of one part rise to so many parts run. For example, a slope that has a rise of 5 feet for every 1000 feet of run would have a slope ratio of 1 in 200.

7. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   To help compare different orders of magnitude, this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly) 1.0 mm – side of a square of area 1 mm²; 1.0 mm – diameter of a pinhead; 1.5 mm – average length of a flea [27]