FAMILY FUN

New Zealand Tablet, Volume XXXVII, Issue 52, 30 December 1909, Page 2078

FAMILY FUN

The Oval Problem.—Given a sheet of drawing-paper arid" a 1 pair of ordinary drawing-compasses, it is required, with--vout •a i ny/,,aiih.ec,{aid«,to_desfl^|)e, ra^ L pvaL:on,tl^ PjA9f^j->Epll i^bh^jßaper4iijitpJ^hef-fortm.)fl£^, cjjin^er, an^W^qceed^ as erAh^gfi^QJj desir^vtp^cTe^crrbea^ircle wponrit. fW-hen the paper is unrolled you will find that, instead of a 'cAijcje, you have an oval. "' "'" Vl\ If''T!herlX)mifalate;WorK.-^|i*oTTr;^li!s puzzle 'a'--boltle W--re-cork c W/sise Ij or'ttvd r i)66 'sm'all'faf* thetheck, sothat if inserted in the ordina'ty^a'^itywoiil'd falliiijto the ' botijble. The bottle being held horizontally, with the cork resting just within the neck, the experimenter_is -invited to try whether he can, by blowing, force it into the bottle. JK-he does notknow the secret^ he will pretty certainly fail. vigorous the ' blow ' the quickerwill be its return.^\Tnis arises from the fact that the act of blowing drives a certain amount of air round the cork into the'ijwbtieKTp*JTbis ogm- . presses the air already in the bottle, tne cotlc^'bobs in v a little way, but the moment the compression ceases the air against the centre of the cork. Tne qu antityofair in too bottle is now not increased, and the cork goes in without the least resistance. - {