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2. Expanded metal - Wikipedia

   en.wikipedia.org/wiki/Expanded_metal

   Expanded metal lath used to support stucco (1919) Facade made from expanded metal. Expanded metal is frequently used to make fences, walkways, and grates, as the material is very durable and strong, unlike lighter and less expensive [dubious – discuss] wire mesh. The many small openings in the material allow flow through of air, water, and ...

3. Marston Mat - Wikipedia

   en.wikipedia.org/wiki/Marston_mat

   RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...

4. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   By contrast, the heaviest class F900 manhole cover can withstand a maximum weight of 90 tons, making it suitable for docks, airports, and other extreme heavy-duty applications. [ 31 ] EN 124 does not apply for gratings of prefabricated drainage channels (according to EN 1433) or floor and roof gullies in buildings (specified in EN 1253-1).

5. Johnson bar - Wikipedia

   en.wikipedia.org/wiki/Johnson_bar

   The Johnson bar was invented by A.L. Johnson [2] of the St. Louis Expanded Metal Company. [3] [when?] Its specific efficacy comes from having "alternate elevations and depressions to grip the concrete," [2] with the shoulders of the corrugations having "an inclination with the axis of the bar" to prevent slipping between the bar and the ...

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7. Grating - Wikipedia

   en.wikipedia.org/wiki/Grating

   A grating can be defined by six parameters: Spatial frequency is the number of cycles occupying a particular distance (e.g. 10 line pairs per millimeter). The period of the grating is the inverse of the spatial frequency, measured in distance (e.g. 0.1 mm). Duty Cycle is the relative thickness of high and low lines. The duty cycle is the ratio ...