The magnetic and electric forces are directed alternately in one direction and the other, and at distances which are called multiples of a wave length the force is in the same direction at the same time, but in the case of damped waves h.as not quite the same intensity.
Marconi's system of electric wave telegraphy consists therefore in setting up at the transmitting station the devices just described for sending out groups of damped electric waves of the above kind in long or short trains corresponding to the dash or dot signals of the Morse alphabet.
In the case of transmitters constructed as above described, in which the effective agent in producing the electric waves radiated is the sudden discharge of a condenser, it should be noticed that what is really sent out is a train of damped or decadent electric waves.
Such a sequence of decreasing electric oscillations and corresponding set of waves is called a damped train.
In the case of the plain or directly excited antenna the oscillations are highly damped, and each train probably only consists at most of half a dozen oscillations.
If, however, the antenna is inductively or directly coupled to a condenser circuit of large capacity then the amount of energy which can be stored up before discharge takes place is very much greater, and hence can be drawn upon to create prolonged or slightly damped trains of waves.
It was found that to achieve this result the transmitter must be so constructed as to send out prolonged trains of slightly damped waves.
When electric oscillations are set up in these two classes of electric radiators, the first class send out a highly damped wave train and the second a feeble damped wave train provided that they have sufficient capacity or energy storage and low resistance.
The joy of the gospel, expressing itself in songs and thanksgivings, is damped (iii.
The Portuguese, in the early part of the 17th century (1578-1640), were under the dominion of Spain, and their enterprise was to some extent damped; but their missionaries extended geographical knowledge in Africa.
His own special "leads" were few, owing to the personal reasons given above; his declaration at the Queen's Hall, London, early in 1907, in favour of drastic land reform, served only to encourage a number of extremists; and the Liberal enthusiasm against the House of Lords, violently excited in 1 9 06 by the fate of the Education Bill and Plural Voting Bill, was rather damped than otherwise, when his method of procedure by resolution of the House of Commons was disclosed in 1907.
As a verb, the word means to stifle or check; hence damped vibrations or oscillations are those which have been reduced or stopped, instead of being allowed to die out naturally; the "dampers" of the piano are small pieces of feltcovered wood which fall upon the strings and stop their vibrations as the keys are allowed to rise; and the "damper" of a chimney or flue, by restricting the draught, lessens the rate of combustion.
When uniformly damped, the leaves are separately opened out and smoothed, the midrib, if not already removed, is torn out, except when " bird'seye " cut is to be made, in which mixture the midrib gives the peculiar " bird's-eye " appearance.
For roll, twist of pigtail tobacco the raw material is damped or sauced as in the case of cut tobacco.
The covers are carefully cut to the proper size and shape with a sharp knife, and, after being damped and smoothed out are placed together in a pile.
The highest class of Cuban-made cigars, called " vegueras," are prepared from the very finest Vuelta Abajo leaf, rolled when it is just half dry, and consequently never damped with water at all.
In another form of apparatus advantage is taken of the property possessed by sodium-potassium peroxide of giving off oxygen when damped; the residue of caustic soda and potash yielded by the reaction is used to absorb the carbonic acid of the expired air.
Such vibrations may be damped out to a considerable extent by the use of a dash-pot, or may be practically prevented by using a relatively stiff spring.
The hopes of Fesch with respect to Regensburg were also damped by an arrangement of the year 1810 whereby Regensburg was absorbed in Bavaria.
In Mareska and Donny's process the condensation is effected in a shallow iron box, which has a large exposed surface, capable of being cooled by damped cloths.
The mixture is slightly damped, moulded into rough bricks, dried and burned.
His controversial ardour was, indeed, somewhat damped by Luther's refusal to answer his arguments, and with a view to earning fresh laurels he turned his attention to Switzerland and the Zwinglians.