Feluicaiy io!/i,igi^.'\ Prockkdincjs. xvii 



Ordinary Meeting, February lolh, 1914. 



Mr. R. L. Taylor, F.C.S., F.I.C., 

 in the Chair. 



A vote of thanks was accorded the donors of the books upon 

 the table. 



Mr. Arthur Adamson, M.Sc.Tech., A.R.C.S., and Mr. 1). 

 Thoday, M.A., were nominated Auditors of the Society's 

 accounts for the session 1913-14. 



Mr. T. Thorp, F.R.A.S., described an experiment he liad 

 been making to ascertain the pressure required to force a film 

 of mercury between two plane surfaces varying from ^oVo ^^ ^^ 

 inch to y/o„- apart. The apparatus used consisted of two 

 planes of thick glass touching at their upper ends but having 

 outlets and separated at their lower by means of a film of 

 celloidin -jjVo of an inch in thickness, the sides being sealed. 

 The lower end communicated, by means of a U tube, with n 

 manometer. The results obtained appear to show that pt=i 

 where p is lbs. per sq. inch and t the thickness in thousandths 

 of an inch, within the above limits, e.g. where / is 21 lbs. per sq. 

 inch then t^ri-^j^o ^^ '^^ inch. The thickness of the fihn was 

 checked by taking the number of interference bands given by 

 sodium light from zero thickness to the point to which the 

 11 ercury had reached at various pressures. 



Mr. R. F. GwYTHER, M.A., read a paper entitled "The 

 Specification of the elements of Stress. Part III. 

 The definition of the dynamical specification and a test 

 of the elastic specification. A Chapter on Elasticity." 



This paper will be printed in full in tiie Memoirs. 



A paper by Mr. M. Copisarow, B.Sc, on " Carbon, 

 its molecular structure and mode of oxidation," was 



postponed until the next meeting of the Society. 



