49 



being magneto and dynamo machines, class 8 electric lights, 

 class 9 electromotors and the electric transmission of power, 

 and class 14 steam engines and gas engines which were employed 

 for driving the above named machines. My class was No. 3, 

 magneto and dynamo machines. Bpfore proceeding to our 

 separate work in the classes, we appointed (upon my proposi- 

 tion) three small temporary Committees to draft a plan for 

 experimental measures in the three departments of mechanics, 

 electricity, and optics, and I was made chairman of the electrical 

 Committee. When these Committees had given in their 

 Reports, one large Committee, of which I was also a member, 

 was appointed to carry out the experiments, and these experi- 

 ments lasted for several weeks, having been concluded only 

 about a fortnight ago. For several days the fourteen classes of 

 jurors were busily occupied in visiting the objects in their 

 several departments, making notes as they went, and receiving 

 explanations from the exhibitors. Then each class spent some 

 days in deliberation and judging, the latter operation being per- 

 formed by a numerical process. Each juror stated a number 

 which in his opinion represented the merit of the object under 

 discussion. The average of these numbers was then taken and 

 recorded by the Chairman as the official verdict. 



Our Chairman in class 3 was Professor Clausius, of Bonn, 

 well known as one of the pioneers of the modern science of 

 Thermodynamics. We also numbered in our ranks, Professor 

 Amsler, of Schaffhausen, inventor of the well known plani- 

 meter ; Professor Kundt, of Strasbourg ; Professor Potier, of 

 the ficole Polytechnique ; Terquem, of Lille ; Ferraris, of 

 Turin ; and Rowland, of the Johns Hopkins University, who was 

 afterwards replaced by Michelson, the measurer of the velocity 

 of light. The only Englishman besides myself was Major 

 Armstrong, who was well versed in the subject from having 

 superintended the experiments of the English Government on 

 the Electric Light at Chatham. 



Our Secretary was an Italian Captain of Engineers, Botto 

 by name, who was exceedingly fluent in the French language, 

 and had made a special study of the subject of our class, having 



D 



