INDEX. 



889 



in the Headings, 726. Law of Cooling of the Short 

 Bar in Terms of the Temperature, 727. Table of Eates 

 of Cooling of Iron Bar, 728. Fourier's Equation for 

 the Cooling of an infinitely long Cylinder, in which the 

 Temperature depends only upon the distance from the 

 axis, and formula deduced from it, giving rate of Cool- 

 ing in Iron and Copper Bars, 729. A more accurate 

 Law of Cooling than that of Fourier, 730. Bates of 

 Cooling of the same Bar, simultaneously indicated by 

 Thermometers whose Bulbs had been immersed for 

 Different Feriods, 731. Statical Curves of Cooling, 

 731. These Curves are not even approximately 

 Logarithmic except for small intervals, 733. Difficulty 

 of determining what to allow for the portion which 

 extends beyond the point of lowest observation of 

 Temperature on the Long Bar, 733. Tables of values 

 of Thermal Conductivity of Iron and Copper, German 

 Silver and Lead, 734, 735. First Method for determin- 

 ing the Electric Conductivity of Bars, 736. Second 

 and Third Methods, 737. Relative Electric Conduc- 

 tivities of Iron, Copper, and German Silver, 738. 

 Table of Thermal and Electric Conductivities at 

 ordinary Temperatures, of Copper, Forbes's Iron, Lead, 

 and German Silver, 739. Summary of Chief Results, 

 739. 

 Telephone. An Account of some Experiments on the Tele- 



phone and Microphone. By James Blyth, M.A., 



557. 

 Thermal and Electric Conductivity. By Professor Tait, 



717. 

 Thermodynamic Motivity. By Sir William Thomson, 741. 

 Thermo-electric properties of Charcoal and certain Alloys, 



with a Supplementary Thermo-Electric Diagram. By 



C. G. Knott, B.Sc, and J. G. MacGregor, D.Sc, 



321. 

 Thomson (Sir William). On Thermodynamic Motivity, 



741. 

 Toothing of Un-round Discs which are intended to Roll upon 



each other. By Edward Sang, 191. 

 Turpentine. On the Discharge of Electricity through Oil of 



Turpentine. By Dr Alexander Macfarlane and 



Simpson (R. J. S.), 673. 



V 



Vowel Sounds. On the Harmonic Analysis of certain Vowel 

 Sounds. By Professor Fleeming Jen kin and J. A. 

 Ewing, B.Sc, 745-777. 



W 

 Wire. Curves produced by Refleotion from a Polished 

 Revolving Straight Wire. By Edward Sang, 

 273. 



