Gilbert light experiments for boys . Fig. 119. RM is throe-fourths of IM inwater and two-thirds of IM in glassFrom Lyndes Physics of the House-hold, published by The Macrnillan Co. FUN BY DAY OR NIGHTExperiment No. 68. Magic lead pencil. Put a pencil ina glass of water in a slanting direction and sight along it (Fig. 120). Does it appear to bebent up? It does,because the lightfrom it is bentas shown inFig. 121. E x p e r i mentNo. 69. Magicruler. Put a rulervertically in apitcher of water Fig. 120. You see a bent pencil to a depth of 4. 78 GILBERT BOY ENGINEERING

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation