Gilbert light experiments for boys . (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. Separ
Gilbert light experiments for boys . (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-. allel Mirrors. YOU Fig. 76. You see an army GILBERT LIGHT EXPERIMENTS 53 Fig, 77. You see many dancers see many imagesbetween two par-allel mirrors be-cause the imageformed in onemirror is an ob-ject in the other,and so on. In Fig. 79, twomirrors, A and B,4 inches apart arefacing each otherand a candle be-tween them is 1 inch from B and 3 inches from A. In B the image Bl is formed 1 inch behind B and in A theimage Al is formed 3 inches behind A. Now image Al is 7 inches in front of B and it formsan image B2 7 inches behind B; similarly image Bl is 5 inchesin front of A and forms an image A2 5 inches behind , A2 is 9 inches in front of B and forms an image B39 inches behind B, and so on. You see many im-ages because the lightwhich enters youreyes has been reflect-ed one or more times. If you are lookingat Bl, the light whichenters your eye ap-pears to come fromBl, but it comes from the candle and is re-Fig. 78. You look into a very deep hole containing n . - much money fleeted f
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation
