Show A during the unusual severity of the past T vinter inter in northern europe the tha seine and other french rivers were frozen over and ami on the return of milder weather amali small ice gorges formed isiach to tho the dismay of 0 the frenchmen unaccustomed as they were to such formations which in this country are of almost annual occurrence nitro glyce rine and other powerful explosives were used to break up the ice with fail fahily ly rood good the illustration is copied from an instantaneous photograph of 0 one of tile the preliminary experiments where a cartridge cartr idee of i N 16 it ll 11 g it 1 11 f P COPIED from AN AD ous cifani was exploded under ot of a boreani of water to judge of tho the effect which it would have upon a of ice the photograph was first published in lu la nature and lias has recently been commented upon in fit popular science news as interest ing both as showing the torin forro or of the wate anle column sold anil the markedly vei tit lit it il ii I 1 loss of the explosion and also as a line of 0 an instantaneous photograph aich must lava have been obtained csider peculiarly difficult conditions A L natural law lav to li eltIng thereisa there is a natural law relating to belting I 1 says baya tho the industrial world which U is not generally known but which is never of 0 value in practice the tha hug or adhesion of a belt is in as s tile the square of the number of degrees which it co ers era on the pulley pulle for example a belt that covers two thirds of tile circumference of a pulley requires four our times abo power to make it slip as it dols does when it coders con ers only one third of at the samu same pulley |