THE 



LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 

 JOURNAL OF SCIENCE. 



[FIFTH SERIES.] 



OCTOBER 1882. 



XXIX. Notes on Practical Electricity. By R. H. M. Bosax- 



QUET, Fellow of St. Johns College, Oxford. 



THE work I Lave Lad in Land for some time past has been 

 the design and construction of clock-regulated uniform- 

 motion machines. As to these, I will only say that the con- 

 structions formerly described by me have been entirely 

 superseded by a new design. This is not yet in a state of 

 sufficient forwardness for description, and I propose to reserve 

 it for another occasion. The working of these machines is 

 dependent on the application of a considerable amount of 

 electrical power. After seeing the Paris exhibition I decided 

 that in all probability a dynamo machine would be a better 

 source for laboratory purposes than batteries, which are in 

 my opinion a nuisance, and subject to most serious defects 

 when used on the large scale. I accordingly set up an A 

 Gramme machine. I also have made a set of accumulators. 

 The practice of the employment of these instruments for 

 ordinary purposes gives rise to numerous points of interest; 

 and I propose to give a short account of my experience. 



The laboratory steam-engine is able to supply sufficient 

 power to give a powerful electric light from the machine. I 

 take it that under these circumstances about 2| horse-power 

 are absorbed altogether. The nominal horse-po"wer of the 

 engine is 2. It is scarcely sufficient to develop the full 

 power of which the dynamo is capable ; but for laboratory 

 purposes it is quite sufficient. 



Phil. Mag. S. 5. Yol. 14. No. 88. Oct. 1882. R 



