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2. Speedometer - Wikipedia

   en.wikipedia.org/wiki/Speedometer

   A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles , they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards. [ 1 ]

3. List of rail transport modelling scale standards - Wikipedia

   en.wikipedia.org/wiki/List_of_rail_transport...

   In terms of model railway operation, gauge 3 is the largest (standard gauge) scenic railway modelling scale, using a scale of 13.5 mm to the foot. The Gauge '3' Society represents this aspect of 2 + 1 ⁄ 2-inch gauge railway modelling with both electric and live steam operation. Gauge '3' corresponds to NEM II scale, also known as "Spur II" in ...

4. List of track gauges - Wikipedia

   en.wikipedia.org/wiki/List_of_track_gauges

   See 3 + 1 ⁄ 2 in (89 mm) gauge ridable miniature railways. 121 mm 4 + 3 ⁄ 4 in: See 4 + 3 ⁄ 4 in (121 mm) gauge ridable miniature railways. 127 mm 5 in: See 5 in (127 mm) gauge ridable miniature railways. 145 mm 5 + 7 ⁄ 10 in and 5 + 45 ⁄ 64 in Denmark: Brandhøjbanen dk, at Hedeland veteran railway dk, Hedeland, Hedehusene, Høje ...

5. Gauge (instrument) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(instrument)

   a cylindrical ring of steel whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object. Strain gauge: a device used to measure the strain of an object. Thread pitch gauge, also called a threading gauge, pitch gauge, or screw gauge a device used to measure the pitch or lead of ...

6. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   feeler gauge: gap widths forward looking infrared (FLIR) detects infrared energy (heat)converts it into an electronic signal, which is then processed to produce a thermal image on a video monitor and perform temperature calculations. framing square: right angles in construction frequency counter: frequency of alternating current: fuel gauge ...

7. Standard-gauge railway - Wikipedia

   en.wikipedia.org/wiki/Standard-gauge_railway

   Opening in 1825, the initial gauge of 4 ft 8 in (1,422 mm) was set to accommodate the existing gauge of hundreds of horse-drawn chaldron wagons [14] that were already in use on the wagonways in the mines. The railway used this gauge for 15 years before a change was made, debuting around 1850, to the 1,435 mm (4 ft 8 + 1 ⁄ 2 in) gauge.