ground crews with bombs as they prepare to load bombers / vs jeep passes by, pulling trailers bearing bombs; one crewman rides atop a bomb / view... - 粉筆劃 個影片檔及 b 捲影像01:02
a man points to a position on a blackboard with his little finger before drawing a sequence of small x-shapes in chalk in an undulating line to indicate how vera rubin showed that stars travel at roughly the same speed irregardless of orbit distances. - 粉筆劃 個影片檔及 b 捲影像00:14
a middle-aged man writes 'speed' and 'distance' onto the axis of a simple graph drawn on an old-fashioned blackboard in order to explain how he would expect time to behave, uk. - 粉筆劃 個影片檔及 b 捲影像00:12
close-up of the hand of a middle-aged man plotting a graph to show the relative speed at which the planets in our galaxy travel around the sun relative to the distance of their orbits from the sun (m equals mercury, v equals venus etc.) with chalk. - 粉筆劃 個影片檔及 b 捲影像00:17地球
close-up sequence showing the shadow created by natural light of a man moving across a blackboard, uk. - 粉筆劃 個影片檔及 b 捲影像00:08數學符號, 超自然現象
a man wearing a shirt who is trying to draw a graph on an old-fashioned blackboard placed in a warehouse studio rubs out a mistake in chalk with an eraser, only to drop the chalk moments later, uk. - 粉筆劃 個影片檔及 b 捲影像00:14
