10. The use of mercury in sensitive imperfect electrical contacts substantially as described.
11. A receiving instrument having a local circuit, including a sensitive imperfect electrical contact or contacts, and a relay operating an instrument for producing signals, actions, or manifestations substantially as described.
12. Sensitive contacts in which a column of powder or filings (or their equivalent) is divided into sections by means of metallic stops or plugs substantially as described.
13. Receivers substantially as described and shown in figures 5 and 8.
14. Transmitters substantially as described and shown at figures 6 and 7.
15. A receiver consisting of a sensitive tube or other imperfect contact inserted in a circuit, one end of the sensitive tube or other imperfect contact being put to earth whilst the other end is connected to an insulated conductor.
16. The combination of a transmitter having one end of its sparking appliance or poles connected to earth, and the other to an insulated conductor, with a receiver as is mentioned in claim 15.
17. A receiver consisting of a sensitive tube or other imperfect contact inserted in a circuit, and earth connections to each end of the sensitive contact or tube through condensers or their equivalent.
18. The modifications in the transmitters and receivers, in which the suspended plates are replaced by cylinders or the like placed hat-wise on poles, or by balloons or kites substantially as described.
19. An induction coil having a revolving make and break substantially as and for the purposes described.
Dated this 2nd day of March 1897.
HALLIDIE LIBRARY
UNIVERSITY
system of train signals re-
ferred to, 101.
Bose, Prof. Chunder, his ex-
citer, 192--his detector, 206.
Bouchotte, experiments in wire-
less telegraphy referred to,
Bourbouze, signalling through
water of the Seine, 66.
Branly, Prof. E., his detector
or "radio conductor," 194,
199 on obstacles to Hertzian
waves, 222 researches on
conductivity under electrical
influence, 292 et seq.
Brooke, Sir W. O'S., experi-
ments in signalling through
water, 39.
Brown, A. C., his invention of
the photophone referred to,
6 - on train telegraphy by
induction, 101-on signalling
across breaks in cables, 175.
Call bell arrangements, 160,
172.
Calzecchi-Onesti, early observa-
tions on the coherer prin-
ciple, 198-his detector, 199
-as a seismological recorder,
ib.
Carty, on the electro - static
effects in telephone circuits,
referred to, 143.
Channing, Dr, on distant cur-
rents picked up in telephone
circuits, 76 on induction
between two telephone cir-
cuits, 80.
Clerk-Maxwell, Prof., his elec-
tro-magnetic theory of light,
177, 265 et seq., 280 et seq.
Coherer. See Detector.
Dolbear, Prof., electro-static
method of telegraphy, 94-
compared with Marconi's, 97
-successful up to 13 miles,
Douat, experiments in wireless
telegraphy referred to, 29.
Dufour, H., inductive effect of
one circuit on a distant one,
79.
Condenser, use of, in wireless Earth, conductivity of the, 3,
telegraphy, 85, 95.
Crookes, Sir W., forecast of the
Marconi system, 201―his
letter to the author re Prof.
Hughes's early experiments,
305.
Currents, electric, Poynting's
theory of, 184-modern views
of, 280 et seq.
D'Asar, Russo, experiments in
Hertz wave telegraphy re-
ferred to, 233.
Davy, Edward, method of sig-
nalling based on electricity
and sound, 6-first inventor
of the relay principle, 7, 38---
proposals for train signalling,
100.
De la Rive, Prof. A., explana-
tion of "Galvanic Music" re-
ferred to, 90.
De la Rive, L. See Sarasin.
Dering, G. E., early telegraphic
apparatus, 48-his lightning-
guards anticipate those of
Siemens and others, ib.
proposals for bare-wire sub-
aqueous telegraph, 49-act-
ually attempted, 53.
Detector, Highton's gold-leaf,
42- Prof. Hertz's, 181, 194
-for Hertzian waves, vari-
ous, 194 et seq., 249, 306 et
seq.-action of detector, 210.
the, 20.
applications of
the, 20,21, 72.
Earth circuit, discovery of the,
3.
Earth - currents or leakages,
140.
Earthquakes, suggested electric
origin of, 2.
Edison, T. A., "Etheric Force "
of, referred to, 98, 309-
electrostatic train teleg-
raphy, 103-potentiality of
the system, 108-its use on
railways, 109—application to
long-distances, 110.
Edwards, his auticatelephor
(? a pneumatic telegraph), 9.
Electric eye, the, 5, 180, 270.
Electricity, definitions of, by
Faraday and others, 139.
Electricity, atmospheric, for
signalling, 68.
atmospheric, ap-
paratus for ob-
serving, 204,
206.
Electricity and light, relation
between, 262 et seq.
Electro-magnets, Morse's, 31-
Edward Davy's, Page's, and
Royal House's referred to, 38.
Ether vibrations, table of, 192.
theory of the, 262 et seq.
Etheric Force, the, referred to,
98, 311.
Evershed, Sydney, attempt to
communicate with lightships
by induction through coils,
127 his delicate relay, 160.
Exciters, Hertzian-wave, vari-
ous, 181, 192, 193, 207, 247.
Exploding by Hertz-waves re-
ferred to, 72, 212, 223.
Granville, W. P. See Smith
and Granville.
Guarini-Foresio, automatic re-
peater for Marconi signals
referred to, 224.
Haworth, John, unintelligible
proposals for a wireless tele-
graph, 56-extracts from his
patent specification, 58---
Cromwell Varley's comments
upon, 61.
Heaviside, A. W., signalling to
bottom of coal-pit by electro-
magnetic induction, 146.
Henry, Prof. Joseph, observa-
tions of (probably) electric-
wave effects, 90, 311 his
life and work referred to,
90- - on high tension and
lightning discharges along
conductors, 184, 277 on
proper construction of light-
ning-conductors, 279.
Hertz, Prof., researches on elec-
tric oscillations, how started,
179-his exciter, 180-his
detector, 181-effect of re-
sonance, ib.-effect of ultra-
violet light, 182-electric
waves in space, ib.-velocity
of, 183-reflection of, 184-
propagation along wires, ib.
--screening effect of metals,
185 electric radiation 190
- electric refraction, 191-
value of his work, ib., 272,
283.
Highton, Henry, proposals for
(1) wireless, (2) bare wire,
and (3) badly insulated wire
telegraphs, 40, 45—his gold-
leaf detector, 42-his new
insulating material, 47—and
other inventions, 48.
Hughes, Prof., remedy for in-
duction between telegraph
wires referred to, 75-ex- Laws of distance, Stevenson's,
periments in wireless teleg-
graphy, 203, 305 et seq.-
discovers electric waves, 306
-his detectors, ib. et seq.
Impedance (choking) coils, good
effect of, 211.
Impulsion-cell as a detector re-
ferred to, 194.
Induction, between wires on
same poles, early notice of,
75-Prof. Hughes's remedy
for, ib.-effect of one tele-
phone circuit on another, 80
—electro-magnetic, early ob-
servations on, 89-Preece on,
143 electro-static, 141-
Carty on, 143.
126 Preece's, 147-Mar-
coni's, 214-Ascoli's, 215.
Le Bon, on obstacles to Mar-
coni waves, 221.
Light and electricity, relation
between, 262 et seq.-electric
light, Lindsay's, 18-ultra-
violet, effect of, on sparks,
182-signalling by means of,
Insulation, telephony without, Lightning-conductors, construc-
Interference in Hertz-wave sig-
nalling, 241, 243, 245, 259.
Jackson, Capt., R. N., experi-
ments in Hertz-wave signal-
ling, 206.
Jervis-Smith, Rev. F., experi-
ments on Hertz-wave signal-
ling, 206.
Johnston, W. P.,experiments on
signalling across rivers, 111.
Joule, welding by electricity
referred to, 23 - elongation
of iron under magnetic strain
referred to, 90,
Kelvin, Lord, referred to, 29,
38, 178, 229, 266, 272, 286
-his law of electric oscilla-
tions, 179.
Kerr, Dr, researches on light,
267.
Langdon Davies, his phono-
phore, wide-spreading effects
of, 124, 260.
tion of, 214, 277,
287.
"1 guards, 48, 194, 196.
Lindsay, J. B., his life and
work, 13-on future uses of
electricity, 16, 20― experi-
ments in electric lighting, 18
-proposals for a telegraph
to America by means of
bare wire and earth-batteries,
20-welding by electricity,
23 telegraphy without
wires, ib. Preece's recol-
lection of, 28-paper read
before British Association,
29 death and memorial,
32.
Lodge, Prof., law of distance
in coil method, 126-con-
ception of electricity, 139-
his detectors, 193, 250-his
lightning - guard, 194 — his
syntonised-wave method, 246
et seq.—his newest proposals,
254
on relation between
light and electricity, 262 et
seq.
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