THE HONGKONG TELEGRAPH.
SATURDAY, JANUARY 19, 1924.
RADIO NOTES AND NEWS. “Listening-In" With the Teeth.
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H. Gernsback. inventor of the asophone, stowing how
it is used, and (above) diagram showing how the esophone is connected.
Daily, science is getting closery warning (both audible and visible, to the solution of the problemn when the state of the track ahead' seeking some means of compens-demands either a complete stop- ation for those lacking any of the page or else an increased need for human senses.
caution on the part of the driver. Radio is taking its part in this The method of working depende felt, especially in its contribu-upon an ingenious use of a certain- tions by which the deaf-or at well-known property of the ordin least the near-deaf-may beary thermionic valve. enabled to hear.
an
The signal valve is located inj Even before the popular use of the driver's cabin, and is contri- radio, deaf mutes have been able ed in series with a local relay to tell what a person was saying by which, in turn, controls a visible | touching the vocal cords, or indicating device and also watching the lips. Now radio alarm bell. makes it even easier. For those who could not be taught to dis-i cern talk by the sense of feeling; for sight, may now "hear" it through use of what is called an osophone.
Such an instrument was in vented a few months ago by an English scientist. but it has been left to H. Gernsback. editor of Science and Invention, and Radio News, New York. to perfect this instrument for simple application.
Gernsbark's ophone depends Jon the transmission of radio waves in the form of vibrations through the teeth. The teeth. Gernsback says, are more sen- sitive to the slightes: vibrations than any other part of the body Therefore, by adapting a receiver- form of instrument for the teeth.
SIMPLE APPARATTS. The circuit is adjusted so that, normally the valve generates a During such time, a current of continuous stream of oscillations.
comparatively large value flows. 13 the plate circuit, which includes tuned "loop." The loop comprises a number of turns of wire wound around a frame
lang just below the platform of the tender in close proximity to the track.
Arranged at intervals along the track itself aro a number of similar "resonant "loops, turned to the same frequency as the valve loop, and arranged to be either open circuited or closed
means of switch mechanism controlled frum, aneigbouring signal-box.
in place of the ears, and attach-in the plate circuit of the valve, Owing to the shape of the loop ing it to a receiving and trans the inductive field of energy mitting instrument, he believes
he has discovered the boon for springing from it is practically deaf persons.
concentrated in one direction"
From the teeth, the vibrations ie downwards towards the track. are transmitted through the bony
Directly the locomotive passes structure of the bead to the audi-over a closed track loop, the latter tory nerve. So that if this nerve
is "impulsed or set into oscilla-: functions at all however slightly from the valve loop to such an tion. It thereby absorbs power the oxophone will in a way restore extent as to stop the valve from his hearing.
Oscillating. In other words, it sucks up more energy than the of supplying. valve is, for the moment. capable
All that is needed is attach. ment of a special form of radio receiver between the osuphone and the transmitting instrument. Just as a normal person puts a telephone receiver to his ear, the deaf listener puts the o-ophone between his teeth. to carry on a conversation."
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THE ELECTRICAL DEPARTMENT THE HONGKONG & SHANGHAI HOTELS, LTD.
HONGKONG HARDWARE CO. "TAI LEE CHAN."
ESTD. 1884-
The stoppage of the valve oscillations reduces the value of the plate current to a point where it is no longer able to support the armature of an electromagnet included in the circuit. This armat- The utility of wireless in con-; ure accordingly drops across the nection with road vehicles is now two contact points indicated. and well established. Several makers; so closes the circuit of a local of the better class of motor-car relay which is then retained in are now making special provision the closed position by means of a in the design of their latest holding coil, until reset by hand. models for the installation of re- The local circuit operates ani ceiving outfits, complete from a
indicating device giving a visible built-in loop aerial to phones, caution or danger signal to the and cars so equipped are already loudly calls his attention to the
driver and an alarm bell which THE HUMAN ZOO indicator. even
to be seen on the road.
The railway offers an
an
:
wider field of development to the If the track loop is left rudio engineer. Numerous "ex-open-circuited, it cannot, of periments have recently been course, oscillate, or pick up carried out particularly in energy, from the valve loop. America, inroceiving broadcast No energy is transferred and, and other telephony for the in- in short. nothing happens. formation and entertainment The application of such arrange- of railway passengers en route.ment to fog signalling is obvious. In most cases
outside Instead of placing the ordinary aerial is used, consisting of one relay of linesmen along the track or more wires supported just over with fog signals and telephones, the top of the carriage, but an the signalman merely closes one inside "loop" owing to its or more distant track loops. The superior directional properties, first may act as a warning, which bas also proved very effective. the driver notes and then resets. Quite apart, however, from its the valve. The second, however, stop." Having brought normal function as a means of means inter-communication, wireless is the train to a standstill, the finding a further and more speci- driver switches the valve over to distinguished authority on Indo purse of £400 to meet her ex-designed and established by the alised use in connection with an outside elevated, aerial, He Malayan and other Asiatic penses. She bas returned £220 wireless branch of the Depart-
railway signalling."
is then in direct communication lepidoptera, died at his residence, as the unspent balance.
ment of Posts and Telegraphs, obvious that a train furnished pick up the instructions to
In the first place, it is, of course, with the signal cabin and can Avonmore-road, West Kensing
are now practically complete, tos, on Dec. 2, at the age of 86. expected to be opened early in says a Delhi message, Trials with a wireless installation is able ahead" as soon as the track is A count made in 1914 showed 1924, when India will have a results obtained up to date have suitable between station and clear weather as an additional
are being carried out, and the to keep in constant touch with clear. that his collection (since
sources of information not usually up to date high-speed duplex exceeded the original expectation
The system can also be used in augmented) of heterocera-Indo-radio service between Rangoon Malayao, Australian, Chinese and Madras. The former also The stations embody, the latest station. This in itself is an ad- Į safeguard for audibly calling the and Japanese comprised 431 may be utilised later for com- type of continuous War appa-
ditional safeguard which, in cer- driver's attention to the fact that types and 40 co-types, early munication with Bangkok and ratus, and other features of the tain circumstances, may be of the he is passing a distant control 7,000 species, and over 40,000 Singapore, or any other service most modern design. They are
utmost value.
signal. Neglect of the prelimin specimens. He was most to the eastward, which may be Continued ut fout of previous which has recently bean patented, of the ordinary type is a fortile The signalling arrangementary warning given by such signals methodical in upkeep,
required,
column.)
is designed to give an automatic) source of accident.
Colonel Charles F.L.S., F.Z.S., F.E.S., late of the Bombay Staff Corps."
Last year Bermondsey Council granted their
The high speed commercial woman Mayor radio stations at Madras and the Councilor Mrs. Ada Salter) a Mingaladon (Burma), which are
go
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