/.'a -ing. niiiJ Rosen hum. 



Phil. Trans., A, Vol. 193, Plate 28. 



Fig. 48. LEAD-TIN EUTECTIC x 750. 



Fig. 49. LEAD-BISMUTH EUTECTIC x 1000. 



. ."in. LEAD-BISMUTH AI.LOV x 1000. 



Fig. 51. LEAD-BISMUTH ALLOY x 1000. 



