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.
This needle or coil must be so damped that when the current is cut off it returns to zero at once without overshooting the mark.
By repeated dippings of damped boards in molten wax (kept in liquid condition in tanks immersed in hot water) until the sheet was of suitable thickness for the purpose.
Rains and spray had damped it; sun and wind had warped it; all the elements had combined to rot a thing that hung so idly.
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.
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.
It was found that to achieve this result the transmitter must be so constructed as to send out prolonged trains of slightly damped waves.
The hopes of Fesch with respect to Regensburg were also damped by an arrangement of the year 1810 whereby Regensburg was absorbed in Bavaria.
Such a sequence of decreasing electric oscillations and corresponding set of waves is called a damped train.
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.