Gilbert light experiments for boys . 52 GILBERT BOY ENGINEERING. (Fig. 75). Doyou find many,many lights? E x p e r i mentNo. 43. Magicarmy. Put anumber of leadsoldiers on a nar-row strip of pa-per and drawthem between the Fig. 75. You see many lights vertical mirrors (Fig. 76). Do yousee an immense army marching in perfect order? Experiment No. 44. Magic dancers. Cut out of paper orcardboard a small figure of a man dancing. Attach him to astring and make him dance between the mirrors in a good light(Fig. 77). Do you find a multitude of dancers who keep timeperfectly ? Experiment No. 45. Magic

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Gilbert light experiments for boys . 52 GILBERT BOY ENGINEERING. (Fig. 75). Doyou find many,many lights? E x p e r i mentNo. 43. Magicarmy. Put anumber of leadsoldiers on a nar-row strip of pa-per and drawthem between the Fig. 75. You see many lights vertical mirrors (Fig. 76). Do yousee an immense army marching in perfect order? Experiment No. 44. Magic dancers. Cut out of paper orcardboard a small figure of a man dancing. Attach him to astring and make him dance between the mirrors in a good light(Fig. 77). Do you find a multitude of dancers who keep timeperfectly ? Experiment No. 45. Magic silver or copper mine. Separatethe mirrors by two blocks, place them one above the other andface to face (Fig. 78) ; place a silver or cop-per coin on the lowermirror. Do you findyourself lookingdown into a verydeep hole with manysilver or copper coinsin it? Why you seeMany Images in Par-

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation