重力:重力的方向是铅丝的方向,它垂直于静止的水面,是垂直的。在远离地球的两点,两根铅丝可以说是平行的。1925年的匿名插图。私人收藏。(Gravity: the direction of gravity is that of the lead wire, it is perpendicular to the surface of the still waters, the vertical. At two points far from Earth, two lead wires can be said to be parallel. Anonymous illustration from 1925. Private collection.)匿名匿名 |
€ 98.15
Enthält 0% MwSt.
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日期不详 · Engraving
· 图片ID: 918713
Private Collection / Bridgeman Images |
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