| Show L Tom HAVE HA VB a t com corn coin trick for tor you to experiment e I ment with today toda boys and girls Take a small glass the tho one shown In this picture Place a small sinai coin in ta It then take a larger coin that will Just about tit ht Into the tho top lop of the he glass or at any rate not go 10 down far into the gloss glass Now blow with all your might on one edge cage of or the large coin This will cause the th coin to turn on Itself ltee as ns a pivot and the force of pt air passing on dOwn d wn 1 tl I Il If j l J f t r K I will catch up the smaller r coin c ln and mi even evon send sand it ling Hying ll ing out of the glass I Another trick which seems sterl ster us indeed od is the following Bring hi in from the thc kitchen two glasses gla ses 0 filled fillod one with WI tb pure water the other V with water I Hand a n couple of of lumps rumps of oC sugar to a af f and toll tell him to drop one into each glass gluss Tho one In the pure water vater IlI dB quickly dissolve but Lut the other lump will remain Of or o course ourse your friend will wonder why this happens so And it will probably probably ably continue to mystify him until you youe 4 sOc see e fit to explain that there was salted suited water in that glass Tho salt sult you see sec makes the water Heavier and less Jess so that it Is not eo so apt to penetrate the pores of ot tile tue lump of 01 sugar 1 suppose you have Jave often orten noticed that When hen you OU thrust a long stick sll k Into a pool l ol olof of water It gives the appearance of ot be being beIng ing bent at the point where it enters the Of Ot course courso you OU understand that It Itis ItIs ItIs is not bent at all But what causes the optical illusIOn Why Vl V this th they y call a n change of ot medium tat t is to say water being much mu h more titan than air 01 tho the Image imago your eye oyo 4 roc receives of or tho immersed Immers d part of or tho the stick sUck represents it at a u higher aught than tho the part of ot the stick sUck that Is out of ot the water is represented by its image imago in your eye e c The Tho difference of ot rued mediums air and ami ant water yater respectively accounts for the th difference of Im agus received by the eye ee Suppose you ou try an experiment Take TakeR H R bowl and place a piece of or money in the tho bottom Ask your our to w mand off orr just far tar enough so that they thuy can can no longer Junger seu see thu tile but no farther Then Thon take lake a n of or water and pour it Into the bowl very gently so as not to disturb thu the coin Ask your jour 1 friends to Watch the inside of tho the bowl closely clos ly and an toll you the tho instant observe anything curious At t a certain Instant t they thuy will cry out Why there thero is the tho coin I se seIt it more and more plainly So they do 10 ace thu tile imago of ot the coin but not the coin U tta Hr lt which still rests on the bottom of ot the t e bowl You 6 seth owing to the change of ot medium m being water now noy instead of ot air the image of ot the coin received by tho the various arlous pairs of eyes e os represents it as ns higher oven even than it really Is just justas justas justas as that part of or the stick which was immersed ed In the pool of or water appears to extend at an au angle anglo higher than that of ot the tho water thus making the tho stick look lo k bent |
