Effects of Strain on the TheTmo-electric Qualities of Metals. 165 



Fehmary 1, 1900. 



The LOED LISTER, F.E.C.S., D.C.L., President, in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : — 



1. " A Case of Monochromatic Vision." By Sir W. de W. Abney, 

 K.C.B., F.R.S. 



IL "Thermal Radiation in Absolute Measure." By Dr. J. T. 

 BoTTOMLEY, F.R.S., and Dr. J. C. Beattie. 



in. "Electrical Conductivity in Gases traversed by Cathode Rays." 

 By J. C. McLennan. Communicated by Professor J. J. 

 Thomson, F.R.S. 



IV. "Researches on Modern Explosives. Second Communication." 

 By W. Macnab and E. Ristori. Communicated by Professor 

 Ramsay, F.R.S. 



V. " On the Influence of the Temperature of Liquid Air on Bacteria." 

 By Dr. Allan Macfadyen. Communicated by Lord Lister, 

 P.R.S. 



"On the Effects of Strain on the Thermo-electric Qualities of 

 Metals. Part IL" By Magnus Maclean, M.A., D.Sc. Com- 

 municated by Lord Kelvin, G.C.V.O., F.R.S. Received 

 . November 22, 1899,— Read January 25, 1900. 



A. — Thermo-electric difference hetioeen free wires and tvires previously 

 subjected to longitudinal extension and lateral compression, hy 

 drawing them through the holes of a draw-plate (§§ 1 — 7). 



§1. In Part I of this paper, read to the Society on 2nd February, 

 1899, the object of the experiments was stated to be the determina- 

 tion of the magnitude of the thermo-electric effects, obtained from 

 any one metal strained and unstrained. The results then given were 

 obtained from two wires of the same material, one wire being pre- 

 viously drawn through a draw-plate, so as to reduce it in size from 

 No. 18 standard gauge (0-122 cm. diameter) to about No. 24 stan- 

 dard gauge (0-0559 cm. diameter). The arrangement of the experi- 



VOL. LXVI. P 



