Scientific amusements . for the experiment, Take a fourth match, and 30 EQUILIBRIUM OF BODIES. handing It to one of )-our audience, request him to lift thethree others with it. If the Seeker, the interesting paper from which weborrow this pleasing problem, be correct, the solution ofthe puzzle will test the patience of many an architect or jrr, .-^-M.,^..—-??,?:.- . r ^ ^1 / Iv:. ^^ ^ ? \ * i 1^ i ^ ^ :? j \ k i 1 i k ^^^ S r 1 ^rjri- ^ 1 J&A $ w Fig. 22. —Problem of the Four TVfatclies. builder who is not previously acquainted with the experi-ment. The upper diagram in the illustration
Scientific amusements . for the experiment, Take a fourth match, and 30 EQUILIBRIUM OF BODIES. handing It to one of )-our audience, request him to lift thethree others with it. If the Seeker, the interesting paper from which weborrow this pleasing problem, be correct, the solution ofthe puzzle will test the patience of many an architect or jrr, .-^-M.,^..—-??,?:.- . r ^ ^1 / Iv:. ^^ ^ ? \ * i 1^ i ^ ^ :? j \ k i 1 i k ^^^ S r 1 ^rjri- ^ 1 J&A $ w Fig. 22. —Problem of the Four TVfatclies. builder who is not previously acquainted with the experi-ment. The upper diagram in the illustration explains themode of proceeding. The way the trick is performedis to allow the third match to fall lightly against thematch you hold, and then lower the hand until this third THE CENTRE OF GRAVITY. 31 match enters within the angle formed by the first pair ;then lift your fourth match and you wpl find that theother matches will rest crosswise on your match, No. iand 2 on one side, and No. 3 on the Fig, 23.—The Tumbler and the Sticks. TO POISE A TUMBLER UPON THREE STICKS, EACHONE OF WHICH HAS ONE END IN THE AIR. Ozanam, in his Mathematical and Physical Recrea-tions in the 16th Century, laid down the followingproblem : Place three sticks on a horizontal plane, sothat each one shall have one end resting on the planeand the other end ^unsupported. 32 EQUILIBRIUM OF BODIES. To perform this experiment, and even to place aweight on the sticks thus poised, you must carefullyproceed as follows:—Place in a sloping position onestick with one end resting on the table and the otherelevated. Put another in a similar fashion above, andresting on the first. Then form a triangle by means ofthe third stick poised in the same way but passing underone and above the other of the two sticks already laiddown. The three sticks will in this manner prove o\mutual support to each other, and will not .give wayeven if a tumbler or other weight be placed upon themover the points of contact, as
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
