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The greater the energy appłkd to rt, tibe deser to the sorface » tbe doubie foyer broken. CanricfaeL most p wbose werk is nnfartanateły pohhshed la the form oi brodmres, and is not to be fonnd in the joornals, has obtained very loweły pfootographs of ertrusion figures, which verify well the mnred-flow kkas described above. He has taken a series of photo-graphs, in rapid saceesson, of streaming materia! which contained smali, inert particles to show the position of the streamlines. The łengths of the hnes produced during each exposure show the velocity of

CHKOSOPHOTOGRAPHIC METHODS 41

tbe ^sreaming partides.¹ MeDmicH and UsŁerlaree

50 Iław Fage and Townend. EiocŁ and ins co-worters iave smdied tbe Ss® oi smali glaas Tods and 3-rrrn.—:al git- nbces XI —iSCS Tnę Sam

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