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2. Category:Pressure gauges - Wikipedia

   en.wikipedia.org/wiki/Category:Pressure_gauges

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3. Inch of water - Wikipedia

   en.wikipedia.org/wiki/Inch_of_water

   Alternative standard in uncommon usage are 60 °F (15,6 °C), or 68 °F (20 °C), and depends on industry standards rather than on international standards. Feet of water is an alternative way to specify pressure as height of a water column; it is conventionally equated to 2,989.067 pascals (0.4335275 psi). [3]

4. Hot-filament ionization gauge - Wikipedia

   en.wikipedia.org/wiki/Hot-filament_ionization_gauge

   The low-pressure sensitivity of hot-cathode gauges is limited by the photoelectric effect. Electrons hitting the grid produce X-rays that produce photoelectric noise in the ion collector. This limits the range of older hot-cathode gauges to 10 −8 Torr and the Bayard–Alpert gauges to about 10 −10 Torr. Additional wires at cathode potential ...

5. Go/no-go gauge - Wikipedia

   en.wikipedia.org/wiki/Go/no-go_gauge

   The lower image is a plain plug gauge used to check the size of a hole; the green end is the go, and the red end is the no-go. The tolerance of the part that this gauge checks is 0.30 mm, where the lower size of the hole is 12.60 mm and the upper size is 12.90 mm, every size outside this range is out of tolerance. This may be initially ...

6. Peckett W4 class - Wikipedia

   en.wikipedia.org/wiki/Peckett_W4_class

   The Peckett W4 class is a class of 0-4-0 ST steam locomotives built by Peckett and Sons at the Atlas Works factory in Bristol, England from 1885 to 1906. 140 Peckett W4 locomotives were built in total, [1] and they were part of a family of six W-class locomotive engines (W2 through W7), which featured cylinders 14 inches (360 mm) in diameter.