Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 45
t their tops. These uprights slide throughvertical holes in the two horizontal bars. The uprights maybe suitably made from darning-needles whose eyes, whenbroken, will form the fork for resting on the sliding bar.The balls may be made by beads cemented on the needle-points, or by small pellets of… … Fig. 9.—Wave Model for Lantern. The experiment with this model consists simply in movingthe bar uniformly along, and watching the consequent motionof the beads as seen projected on the lantern-screen. From the construction of the apparatus, the points notedin this paragraph immediately follow for…
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