A Monthly Record of Scientific Progress in Radio-telegraphy and Telephony.
In wireless telegraphy "arcing" is principally caused by the continuation of the supply current in the spark-gap after the capacity has been charged to a potential sufficient to break down the insulation of the gap.
A Monthly Magazine devoted to Wireless Telegraphy and Telephony.
One system of photo-telegraphy in use at the present time, employs what is known as an electrolytic receiver (see Chapter III.
In one system of ordinary photo-telegraphy synchronism is obtained in the following manner.
The most suitable film to use for purposes of photo-telegraphy is one having a fairly slow speed in which the range of exposure required comes well within the limits of the film.
The foregoing narrative will make amply clear the future possibilities of telegraphy as a coadjutor of Astronomy in the observation of total eclipses of the Sun.
You know how hard I have been plugging away at telegraphy in spare time during the last few months?
In the Army bothtelegraphy and signaling are work usually performed by members of the Signal Corps.
A powerful wirelesstelegraphy installation is to be fitted in the wireless cabin in the forward control compartment.
Such an early interruption to our progress caused a little chagrin, but the veterans of submarine telegraphythought nothing of it.
Author of "American Telegraphyand Encyclopedia of the Telegraph," "Wireless Telegraphy.
The direct currents of telegraphy are prevented from passing to ground through the telephone set during conversation by the 2-microfarad condenser which is in series with the receiver.
Simplex and composite circuits are arrangements of wires whereby telephony and telegraphy can take place at the same time over the same wires without interference.
The Cyclopedia of Telephony and Telegraphy presents a comprehensive and authoritative treatment of the whole art of the electrical transmission of intelligence.
The well-known type of relay employed in telegraphy would answer the purpose well but for the amount of room that it occupies, as it is sometimes necessary to group a large number of relays in a very small space.
The sections on Telegraphy cover both commercial service and train dispatching.
The foregoing are problems of making telegraphy a by-product of telephony.
Both telegraphyand telephony over simplex circuits follow their usual practice in the way of calling and conversing.
But underneath the great tenors of wireless telegraphy whisper the myriads of baritones, basses, members of the chorus.
In 1894 Mr. Marconi began communicating through space without wires, and it may be said that wireless telegraphy has ever since been the world's imminent invention.
Though he was only twenty-seven years old, his experience as an inventor covered many years, for he began experimenting in wireless telegraphy before he was twenty.
And this is in bare outline Mr. Marconi's invention--this is the combination of devices which has made wireless telegraphy possible, the invention on which he has taken out more than 132 patents in every civilised country of the world.
In wireless telegraphythe trouble has been that it was difficult to keep the sending and the receiving instruments attuned.
A sort of impression prevails that wireless telegraphy is still largely in the uncertain experimental stage; but, as a matter of fact, it has long since passed from the laboratory to a wide commercial use.
Then there is the whole question of the use of wireless telegraphy on land, a subject hardly studied, though messages have already been sent upward of sixty miles overland.
Might not the signals which he received have been sent from some passing ship fitted with wireless-telegraphy apparatus?
Without secrecy no system of wireless telegraphy could ever reach great commercial importance, or compete with the present cable communication.
Within comparatively recent years busy inventors have thought out several new plans for lighthouses, which are quite as wonderful and important in their way as wireless telegraphy and the telephone are in the realm of electricity.
Wireless telegraphy flashed the news of the success of the ruse to the Commander-in-Chief.
This code has come to be used throughout the world for wireless telegraphy and hence it is now called the International code.
A tube with two or three electrodes from which the air has been exhausted, or which is filled with an inert gas, and used as a detector, an amplifier, an oscillator or a modulator in wireless telegraphy and telephony.
The receptor for wireless telegraphy and telephony is the same and may include either a crystal detector or a vacuum tube detector, as will be explained presently.
The aerial wire is precisely the same for either wireless telegraphy or wireless telephony.
The true value of electric telegraphy was first demonstrated to the Japanese in connexion with an insurrection in 1877, under the leadership of Saigo, the favourite of this same Shimazu Nariakira.
Wireless telegraphy began to come into general use in 1908, when several vessels belonging to the principal steamship companies were equipped with the apparatus.
In the sphere of telegraphy the progress has not been less marked.
In bothtelegraphy and telephony, the longer the line the weaker the current which is received at the distant end.
As the current in the telephone line varies rapidly, certain other properties of the line assume an importance they do not have in telegraphy in any such degree.
Telegraphy through such a line by ordinary means would be impossible.
In both telegraphyand telephony, there is a length of line with a given kind and size of wire and method of construction over which it is just possible to send intelligible speech or intelligible signals.
At Harvard and Mare Island the radio students are put through four months' courses, which embraces not only radio-telegraphy and allied subjects, but military training.
There is indeed little doubt that with Mr. Tesla's devices, harmonic and synchronous telegraphy will receive a fresh impetus, and vast possibilities are again opened up.
Of course, wireless telephony and telegraphy will replace light-signaling to some extent, but there are many fields in which the last-named is still supreme.
Any luminous source such as the sun, a candle flame, or an incandescent lamp is sending forth electromagnetic waves not unlike those used in wireless telegraphy excepting that they are of much shorter wave-length.
With the advent of wireless telegraphy light-signaling for long distances was temporarily eclipsed, but during the recent war it was revived and much development work was prosecuted.
The marvellous development of telegraphy within the last generation has called into existence a great variety of receiving instruments, each admirable in its way.
In telegraphy and typewriting, it is almost inevitable that the learner should start with the alphabet and proceed to gradually larger units.
The rhythmical and other groups that are found or made by the learner in memorizing nonsense lists are, in effect, "higher units", and have much the same value as the higher units of telegraphy or typewriting.
A student of telegraphy was tested once a week to see how rapidly he could send a message, and also how rapidly he could "receive a message off the wire", by listening to the clicking of the sounder.
Higher Units and Overlapping The acquisition of skill in telegraphy consists mostly in learning these higher units of reactions.
The Learning of Complex Practical Performances A great deal of light has been thrown on the learning process by psychological studies of the course of improvement in mastering such trades as telegraphy and typewriting.
In wireless telegraphy also the Receiver, perfected by Marconi, is affected by rills, made by a splash of electric discharge, over 3000 miles away.
Now on these two occasions when wireless telegraphy was found to be unreliable, the usefulness of the submarine bell at once becomes apparent.
Submarine signalling has never received that public notice which wireless telegraphy has, for the reason that it does not appeal so readily to the popular mind.
Then Tommy took up the subject, discussing wireless telegraphy with great confidence, but in an unscientific manner that would have brought groans of anguish from one familiar with the subject.
Had Harriet Burrell understood a little more of telegraphy she would have known, though unable to read the dots and dashes, that the operator was calling some one who did not answer.
On the 10th of September following the writer was fortunate in carrying out some wireless telegraphy experiments in a balloon, the success of which is entirely due to the unrivalled skill of Mr. Nevil Maskelyne, F.
In any future attempt to reach the Pole by balloon it is not unreasonable to suppose that wireless telegraphy will be put in practice to maintain communication with the base.
This form of kite, which has been further developed, has been used in the South African campaign in connection with wireless telegraphy for the taking of photographs at great heights, notably at Modder River, and for other purposes.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "telegraphy" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: code; electricity; key; receiver; sounder; telegraphy; telex; ticker; transmitter
