128 
GENERAL INDEX. 
-^Electric balance, F. H. Varley on the, 
1869, 46 
-balances, Sir IV. Thomson on new, 
1887, 582 
-block telegraphs, F. H. Varley on, 
1877, 219 
-*-- cables, C. F. Varley on a method 
of testing submerged, 1871, 48 
-- cables, with reference to observa¬ 
tions on the Malta-Alexandria tele¬ 
graph, Dr. Ernest Esselbach on, 1862, 26 
-capacity of certain accumulators, 
Dr. A. Muirhead on the constancy of, 
1879, 283 
-. circuits, safety fuses for, Prof. Sir 
Wm. Thomson on, 1881, 632 
-condenser, capacity of a certain, and 
on the value of V, C. Hockin on the, 
1879, 285 
- condensers, Dr. Esselbach on the 
determination of the absolute quantity 
of charye on, 1862, 27 
- conduction, continuity of, Dr. J. 
Ilophinson on, 1886, 309 
- conduction of alloys and solid sul¬ 
phides, Dr. J. H. Gladstone and W. 
Hibbert on the, 1888, 347 
- control for an equatorial clock- 
movement, the Earl of Posse on an. 
1884, 636 
-- convection-currents, Prof. S. P. 
Thompson on, 1880, 470 
--current accumulator, Sir W. Thom¬ 
son on a uniform-, 1867, 16 
-- cu rrent, the action of an, in hastening 
the formation of lagging compounds, 
Dr. J. H. Gladstone on, 1887, 344 
-- current, constant, with varying 
electro-motive force, the production of 
a, from a dynamo, A. P. Trotter on, 
1887, 616 
*-current, direction of the, J. C. Bow¬ 
ring on the, 1865, 28 
-current, a divided, an experiment 
showing that it may be greater in both 
branches than in the mains, Lord Ray¬ 
leigh on, 1886, 527 
-current, the influence of an, on the 
thinning of a liquid film, Profs. A. W. 
Remold and A. W. Rucker on, 1884, 
652 
--current, laws defining the strength 
of the, which can be sent through wires 
of different diameters without raising 
the external temperature above a cer¬ 
tain limit, Prof. G. Forbes on the, 1882, 
668 
- current meter. Prof. G. Forbes on 
an, 1S87, 564 
-- current-weigher, a new form of, 
Prof. J. Blyth on, 1889, 511 
-currents, the absolute measurement 
of, Prof. Lord Rayleigh on, 1882, 445 
- currents, alternating, the energy 
lost by radiation from, Prof. FitzGerald 
on, 1888, 404 
Electric currents, Dr. Joule's determina¬ 
tion of the dy namical equivalent of heat 
from the thermal effects of, 1867, 512 
- currents, earth, Prof. Matteucci on, 
1886, 463 
-currents, detection of weak, F. H. 
Varley on the construction of a galvano¬ 
meter for the, 1868, 20 
- currents, duration of free, in an 
infinite conducting cylinder, Prof. 
Lord Rayleigh on the, 1882, 446 
-currents produced by the Gramme 
magneto-electric machine, notes of ex¬ 
periments on the, by A. N. Breguet, 
1874, 33 
-currents and potentials, constant 
gravitational instruments for measur- 
ing, Prof. Sir W. Thomson on, 1885, 905 
-currents, repulsion of wdres in¬ 
fluenced by, W. H. L. Russell on the, 
1879, 263 ' 
-currents, steady and alternate, the 
relative effects of, on different con¬ 
ductors, W. H. Preece on, 1889, 513 
-discharge, analysis of the luminous, 
by his photographic revolver, Dr. J. 
Janssen on the, 1888, 615 
- discharge. J. P. Gassiot on the 
change of form and colour which the 
stratified discharge assumes when a 
varied resistance is introduced in the 
circuit of an extended series of the 
voltaic battery, 1865, 15 
-induction-discharge in vacuum- 
tubes, J. P. Gassiot on the metallic 
deposit obtained from the, 1869, 46 
-discharge from a Leyden jar, Dr. 
W. Feddersen on some peculiarities in 
the, 1874, 27 
-discharge through colza oil, A. Mac- 
farlane on the, 1881, 556 
- endosmose and other allied pheno¬ 
mena, the theory of, Prof. II. Lamb on, 
1887, 495 
-- energy, some applications of, to hor¬ 
ticultural and agricultural purposes, 
Dr. C. W. Siemens on, 1881, 474 
-furnace, Dr. C. W. Siemens and 
Prof. A. K. Huntington on the, 1882 ,496 
-illumination, the amount of nitrous 
acid produced in, Prof. J. Dewar on, 
1879, 317 
-illumination of lighthouses, Dr. 
J. Hopkinson on, 1886, 811 
- induction and conduction, O. J. 
Lodge on a mechanical illustration of, 
1876, 42 
-induction between wires and wires, 
W. H. Preece on, 1886, 546 
-lamp, a portable, W. H. Preece on, 
1886, 812 
- lamps, incandescent vacuum, with 
