The tattooed immortal with cocoa skin sat forward, his magic vibrating in the air around him.
In the former he developed a valuable method for the investigation of aerial waves within pipes, based on the fact that a finely divided powder - lycopodium, for example - when dusted over the interior of a tube in which is established a vibrating column of air, tends to collect in heaps at the nodes, the distance between which can thus be ascertained.
The only official standard is the French, dating from 1859, preserved by a tuning-fork vibrating 870.9 (double vib.
Marconi, by giving great attention to details, improved the electromagnetic tapper, and, combining it with his improved form of sensitive tube, made a telegraphic instrument as follows: the small glass tube, containing nickel and silver filings between two silver plugs, was attached to a bone holder, and under this was arranged a small electromagnet having a vibrating armature like an electric bell carrying on it a stem and hammer.
Essential are vibrating membranes between the cartilaginous framework, and next, special muscles for regulating the tension.
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