Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 35
he apparatus we shall want will be verysimple : it will consist of two cards and a pair of scissors.The boy will kindly shape his card to such an angle that whenhe holds it to his eye one side of the angle shall point straightat the little girl, and the other side shall point straight at theball,… … Fig. 5.—How we measured the height of the ball. to the ball. It will be necessary to cut these angles pro-perly. If the angle be too big, then when one side points tothe boys face, the other will be directed above the ball. If The Sun. 21 the angle on the card be too small, then one side will be…
Astronomy
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
