122 ETJTECTIC RESEARCH : THE ALLOYS OF LEAD AND TIN. 



DESCRIPTION OF PLATES (5-9). 

 PLATE 5. 



Fig. 14. Alloy with 15 per cent. Sn after four weeks at 175 C. V. x 100 diameters. 



15. Alloy with 20 per cent. Sn after prolonged heating. V. x 300 diameters. 



16. Alloy with 45 per cent. Sn. V. x 200 diameters. 



17. Alloy with 63 per cent. Sn (eutectic alloy). V. x 300 diameters. 

 18. Alloy with 65 per cent. Sn. V. x 200 diameters. 

 19. Alloy with 74 per cent. Sn. V. x 200 diameters. 



PLATE 6. 



Fig. 20. Alloy with 85 per cent. Sn. V. x 200 diameters. 



21. Alloy with 95 per cent. Sri. V. x 200 diameters. 



22. Alloy with 99 per cent. Sn. V. x 200 diameters. 



23. Alloy with 10 per cent. Sn cooled from fusion. V. x 150 diameters. 



,, 24. Alloy with 15 per cent. Sn cooled from fusion. V. x 150 diameters. 



PLATE 7. 



Fig. 25. Alloy with 16 per cent. Sn quenched in liquid air from 160 C. V. x 1000 diameters. 



,, 26. Alloy with 16 per cent. Sn very slowly cooled after prolonged heating. V. x 1000 diameters. 



27. Alloy with 16 per cent. Sn very slowly cooled after long heating,. V. x 1000 diameters. 



28. Alloy with 18 per cent. Sn quenched in liquid air from 160 C. V. x 1000 diameters. 



,, 29. Alloy with 18 per cent. Sn very slowly cooled after prolonged heating. V. x 1000 diameters. 



PLATE 8. 



Fig. 3L Eutectic alloy showing regular lamination. V. x 600 diameters. 



32. Eutectic alloy showing junction of two "grains." V. x 300 diameters. 



33. Eutectic alloy showing junction of three " grains." V. x 300 diameters. 



34. Laminated eutectic alloy. V. x 600 diameters. 



35. Laminated eutectic alloy. V. x 1200 diameters. 



,, 36. Alloy with 64 per cent. Sn. V. x 200 diameters. 



PLATE 9. 



Fig. 37. Alloy with 65 per cent. Sn. V. x 600 diameters. 



,, 38. Segregated eutectic alloy. V. x 200 diameters. 



39. Eutectic alloy showing " spherulitic lustre.' 1 Oblique. x 12 diameters. 



40. Alloy of eutectic composition made by compressing the powdered ingredients. V. x 80 



diameters. 



41. Alloy of eutectic composition from compressed powder. V. x 80 diameters. 



42. Alloy containing 17 per cent. Sn from compressed powder. V. x 80 diameters. 



