462 INDEX. 



Page. 

 Electricity — 



The Conducting Power of Different Substances.-^ •. 360 



Production of Electricity by Escape of Steam 360 



Faraday's Researches on Hydro-electricity 362 



Excitation of Electricity by the Escape of Liquid Carbonic Acid 364 



Armstrong's Hydro-electric Machine 364 



Source of Atmospheric Electricity unknown 366 



The Electrical Machine 368 



Improvements in the Gold Leaf Electroscope 372 



Improvements in Coulomb's Torsion Balance ^ 373 



Electroscopes to which the Principle of the Torsion Balance has been ap- 

 plied 376 



Petrina' s Electroscope ^ 379 



Observation of Atmospheric Electricity 380 



Induction of Electricity _. 382 



Notes on Translation of Terms 381 



Knockenhauer's Researches 386 



Experimental Proof that the quantity of Latent Electricity is inversely as 



the square of the distance from the Inducing Body 386 



Knockenhauer' s further Experiments 390 



Faraday's Researches 390 



Specific Capacity of Induction. __ 391 



Induction in Curved Lines 395 



Faraday's Theory of Induction 397 



Munck af Rosenchold on Induction 400 



Riess on Electricity and the Theory of Condensers 401 



Electrical Effects of Flame 409 



The Leyden Jar and Effects of the Discharge 414 



Abria on the Mechanical Phenomena accompanying Electrical Discharge. 414 



Repulsion of the Inner Coating of the Battery 416 



Striking Distance of the Battery 418 



Striking Distance of the Battery, independent of the Conducting Circuit.. 420 



Quantity of Electricity disappearing by discharge at the striking distance. 421 



Results by the ordinary mode of discharge. 423 



Results by discharge at the striking distance 423 



Heating of the connecting wire of the electrical battery 425 



Influence of the thickness of the wire in the Thermometer 427 



Influence of the length of the wire in the Thermometer 429 



Influence of breaks in the wire upon the rise of Temperature 430 



Heating power of obstructed discharge 431 



Marks left by Electricity upon glass and mica 432 



The Air Thermometer 433 



Theory of tlie Instrument _ 435 



Influence of the length of the connecting wire on its rise of Temperature. . 438 



Influence of the thickness of the connecting wire upon its Temperature - _ 440 



Temperature in the main conductor of a branched circuit 440^ 



Temperature in a branch of the conducting circuit 443 



Electrical retarding power of metals 444 



Capacity of metals for the development of heat 447 



