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The Cavendish experiment, performed in 1797–1798 by English scientist Henry Cavendish, was the first experiment to measure the force of gravity between masses in the laboratory [1] and the first to yield accurate values for the gravitational constant.
The 45 mm gauge originated from 1 gauge or "gauge one" which was first used in Europe and Britain and used to model standard gauge trains in the scale of 1:32. LGB were first to adopt the term G scale and used the gauge of 45 mm (1.772 in) to model 1,000 mm gauge European trains in 1:22.5 scale.
a foreshortening technique using N scale model trains in the background (distance) with HO scale in the foreground. mixing 1:43 scale, 1:48 scale and 1:50 scale die-cast models with O scale model trains. using Matchbox cars (1:64 to 1:100) with HO scale and S scale. mixing OO scale British model trains with HO scale models. Both scales run on ...
Based on this, Hutton's 1778 result is equivalent to G ≈ 8 × 10 −11 m 3 ⋅kg −1 ⋅s −2. Diagram of torsion balance used in the Cavendish experiment performed by Henry Cavendish in 1798, to measure G, with the help of a pulley, large balls hung from a frame were rotated into position next to the small balls.
A worldwide garden railroad scale. Corresponds to NEM III and NMRA 3 ⁄ 4 inch. -1:12: 4 + 3 ⁄ 4 in (121 mm) North America specific scale corresponding to NMRA 1-inch scale. 1:12 is one of the most popular backyard railway scales. -1:11: 5 in (127 mm) Used outside North America. Corresponds to NEM V. One of the most popular garden railway ...
The largest common scale is 1:8, with 1:4 sometimes used for park rides. G scale (Garden, 1:24 scale) is most popular for backyard modelling. It is easier to fit a G scale model into a garden and keep scenery proportional to the trains. Gauge 1 and Gauge 3 are also popular for gardens. O, S, HO, and N scale are more often used indoors. [7] [8]
Thus the scale and approximate prototype gauge are represented, with the model gauge used (9 mm for H0e gauge; 6.5 mm for H0f gauge) being implied. [ 2 ] The scales used include the general European modelling range of Z, N, TT, H0, 0 and also the large model engineering gauges of I to X, including 3 + 1 ⁄ 2 , 5, 7 + 1 ⁄ 4 and 10 + 1 ⁄ 4 ...
Gn15 is a rail modelling scale, using G scale 1:22.5 scale trains running on H0/00 gauge (16.5 mm / 0.65 in) track, representing minimum gauge and miniature railways. Typical models built are between 1:20.3 and 1:24, [ 1 ] or up to 1:29.