232 ADJOURNED DISCUSSION IN LONDON 



(b) Metallurgical . 



Dr. W. Rosenhain, F.R.S., " The Metallurgical Microscope." 



Professor Cecil H. Desch, D.Sc, " The Construction and 

 Design of Metallurgical Microscopes." 



Mr. E. F. Law, " The Microscope in Metallurgical Research." 

 Mr. H. M. Sayers, " Illumination in Micro-metallography." 



(c) Petrolo(/icaI. 



Dr. J. W. Evans, F.R.S., '' The Requirements of a Petro- 

 logical Microscope." 



Sir Robert Hadfield, F.R.S,, in taking the Chair during 

 the reading of the metalhirgical papers, said : 



I do not intend to take up much of your time, but should like 

 to say in a few words how very gratified I feel to see this important 

 gathering continuing the work we tried to do a couple of months 

 ago. We then had something like 40 papers presented, and as, of 

 course, it was quite impossible to do more than touch upon the fringe 

 of the discussion of them, I may also add that out of that large 

 gathering in the Rooms of the Royal Society we have had a con- 

 tinuation of the same work in the cities of Sheffield and Glasgow. 

 That will show you that we did really stir up not only the metro- 

 polis, but also the north and the far north. As I am taking the 

 Chair during the reading of the papers in the metallurgical section, 

 I would like to say how very important we find the microscope as 

 regards metallurgical operations and investigations. My friend Mr. 

 Barnard has said that we do not think sufficiently of resolution and 

 that we are rather too fond of magnification. I still have a little 

 feeling for magnification, but cannot help thinking that we shall, 

 aided by resolution — the double resolution of the microscope and 

 our own resolution — find out improved methods of handling steel. 

 That is a matter I am specially interested in. The more one studies 

 the structure of iron and steel, the more fascinating it becomes. To 

 use an illustration in which I have been concerned very much during 

 the war, i.e., the production of the large calibre armour piercing 

 shell, we could not really have obtained a shell of the requisite 

 quality without the use of the microscope. When one considers 

 that the 18-inch gun carried a projectile with a muzzle energy of 

 150,000 foot-tons, oii.e can imagine the tremendous stresses which 

 occur when that shell is suddenly brought to rest by the armour 

 attacked, and yet it must not break. Out of those war reF^earches are 

 proceeding further investigations which will apply that information to 

 the arts of peace, and I do not think it will be found that we have 

 wasted our time. W^e in England were not behind, but we wanted 

 stimulating a little, and a great deal of investigation work was 

 carried out during the war which would not< have been done other- 

 wise, because in times of peace the money could not be found. 



