vi Proceedings. \October 15th, 1Q12. 



Mr. Arthur Ad.\mson, M.Sc.Tech., A.R.C.S., exhibited 

 and described an apparatus which could be used for 

 the exact trisection of an angle, a problem which is, in 

 general, impossible of solution by ordinary geometrical methods. 



A paper by Mr. Adamson on the subject will appear in the 

 Memoirs. 



Professor \V. W. Haldank Gke, B.Sc, M.Sc.Tech, 

 A.M.I.E.E., said that since Mr. Adamson explained his model to 

 him he had taken some interest in the historic problem of the 

 trisection of an angle. About 2,300 years ago the sophists were 

 busy with three geometrical problems — ( i) squaring the circle, (2) 

 doubling the cube, and (3) the trisection of the angle— few 

 problems in mathematics have been studied so persistently. 

 They were found insoluble by the use of straight lines and 

 circles only. Hippias of Elis was one of the first to study the 

 trisection problem. He discovered the quadratrix. About 200 b.c. 

 the conchoid was invented and applied to the trisection of 

 an angle. In the works of Pappus a number of solutions are 

 collected. Reference was also made to the work of Archimedes 

 (287-212 B.C.), Vieta (1540-1603), Snell (1591-1626), Descartes 

 (1596-1650), Viviani (1622-1703), Pascal (1623-1662), Huygens 

 (1629-1695), Tscbenhausen (1631-1728), Newton (1642-1727), 

 and others. 



A paper by Mr. D. M. S. Watson, M.Sc, entitled 

 "The larger Coal-Measure Amphibia," was read by 



Dr. HiCKLING. 



The paper is printed in full in the Memoirs. 



(General Meeting, October 29th, 191 2. 



The President, Professor Y. E. \Vkiss, D.Sc, F.L.S., in the Chair. 



Mr. A. W. RvMER Roberts, M.A. (Cantab.). Elkrbeck, 

 Crook., 7iear Kendal., was elected an ordinary member of the 

 Society. 



