at the tube must be held obliquely with its upper endpointing forward. For let BC be the axis ofthe tube when the ball is justentering it at B. Let AA bethe vertical path of the ball,and let BC have come toBC when the ball is at A.BC is parallel to BC. Thenprovided BC passes throughA the ball will… … 17-19] THE VELOCITY OF LIGHT. 25 a point on its axis such as A vertically beneath A; in orderthen that the ball may fall vertically and yet pass throughthe moving tube this must be held obliquely and to an observermoving with the tube the ball would appear to move obliquelyand not vertically.…
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