INDEX. 
in the Readings, 726. Law of Cooling of the Short 
Bar in Terms of the Temperature, 727, Table of Rates 
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. Rates of 
Cooling of the same Bar, simultaneously indicated by 
Thermometers whose Bulbs had been immersed for 
Different Periods, 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= 


889 
phone and Microphone. By Jamus Buiyru, M.A., 
557. 
Thermal and Electric Conductivity. By Professor Tarr, 
ali 
Thermodynamic Motwity. By Sir Witt1am THomson, 741. 
Thermo-electric properties of Charcoal and certain Alloys, 
with a Supplementary Thermo-Electric Diagram. By 
C. G. Knorr, B.Sc., and J. G. MacGregor, D.Sc., 
321. 
THomson (Sir William). 
741, 
Toothing of Un-round Discs which wre intended to Roll upon 
each other. By EpwarD Sane, 191. 
Turpentine. On the Discharge of Electricity through Oil of 
Turpentine. By Dr ALEXANDER MACFARLANE and 
Srupson (R. J. 8.), 673. 
On Thermodynamic Motivity, 
Vv 
Vowel Sounds, On the Harmonic Analysis of certain Vowel 
Sounds, By Professor FLEEMING JENKIN and J, A. 
Ewine, B.Sc., 745-777. 
W 
Wire. Curves produced by Reflection from a Polished 
Revolving Straight Wire. By Epwarp Sana, 
273. 
