386 SECTIONAL TRANSACTIONS.— G, H. 



The importance of a light-coloured surface is stressed and the results of 

 some experiments are given. 



Continuity on the road is considered to be necessary — such as continuity 

 in conspicuity and rugosity as well as continuity in super-elevation, traffic 

 signs, etc. Equal rugosity across the road is necessary as well as continuity 

 in rugosity along the road. 



Finally, the paper deals briefly with the bearing of surface irregularities on 

 the safety problem. 



Mr. H. Ricardo, F.R.S. — High speed Diesel engines (12.0). 



Afternoon. 

 Visit to Leyland Motors, Ltd. 



Wednesday, September 16. 



Dr. Margaret Fishenden. — Some measurements of radiation from com- 

 bustion gases (10.0). 



Dr. R. H. Evans and Dr. R. H. Wood. — Transverse elasticity of building 

 materials (10.45). 



The paper deals chiefly with the transverse elastic and plastic strains in 

 building materials when tested in both tension and compression. Experi- 

 ments have been made on columns of concrete, sandstone, slate, granite, 

 marble, and ebonite, attention being devoted to the transverse and longi- 

 tudinal strains and to the influence of that characteristic inherent in building 

 materials known as creep. The illustrations in the paper refer to concrete. 



The results obtained show quite definitely that lateral creep does occur 

 in materials like concrete and sandstone at the same time as longitudinal 

 creep. This is true in both tension and compression. At the higher 

 stresses in compression, namely, above £ to f of the crushing stress, the 

 lateral creep amounts to several times the longitudinal creep. It is suggested 

 that this phenomenal increase in the magnitude of the lateral creep may be 

 due to the formation of longitudinal cracks in the column. The diagrams 

 given show the existence of ' elastic-after-strain ' and that transverse strains 

 form hysteresis loops under cycles of loading. 



Dr. A. L. Rawlings. — Sound locators for directing searchlights (11.30). 



SECTION H.-ANTHROPOLOGY. 



Thursday, September 10. 



Presidential Address by Miss D. A. E. Garrod on The Upper Paleo- 

 lithic in the light of recent discovery (10.0). 



Mr. A. Leslie Armstrong. — The antiquity of man in Africa as demon- 

 strated at the Victoria Falls (11.0). 



The Rhodesian Archaeological Expedition, 1929, provided the oppor- 

 tunity to investigate the sequence of Stone Age cultures represented by 

 implements known to occur in the gravels of the old river bed and terraces 



