LECTUKES XO THE OPERATIVE CLASSES. 



Ixvii 



Date and Place 



1876. Glasgow ... 



1877. Plymouth.., 



1879. Sheffield ... 



1880. Swansea .., 



1881. York 



1882. Southamp- 



ton. 



1883. Southp )rt 



1884. Montreal ... 



1885. Aberdeen... 



1886. Birmingham 



1887. Manchester 



Lecturer 



Commander Cameron, C.B., 



R.N. 



W. H. Preece 



W. E. Ayrton 



H. Seebohm, F.Z.S 



Prof. Osborne Reynolds, 



F.R.S. 

 John Evans, D.C.L. Treas. R.S. 



Sir F. J. BramweU, F.R.S. ... 



Prof. R.S. Ball, F.R.S., 



H. B. Dixon, M.A 



Prof. W. C. Roberts-Austen, 



F.R.S. 

 Prof. G. Forbes, F.R.S 



Subject of Discourse 



A Journey through Africa. 



Telegraphy and the Telephone. 



Electricity as a Motive Power. 



The North-East Passage. 



Raindi'ops, Hailstones, and Snow- 

 flakes. 



Unwritten History, and how to 

 read it. 



Talking by Electricity — Telephones. 



Comets. 



The Nature of Explosions. 



The Colours of Metals and their 

 Alloys. 



Electric Lighting. 



d2 



