In addition he added certain spark-generating coils across the contacts of the relay and tapper.
The singleneedle instrument is a vertical needle galvanoscope worked by a battery and reversing handle, or two " tapper " keys, the motions to right and left of one end of the index corresponding to the dashes and dots of the Morse alphabet.
He caused the relay in series with the sensitive tube to set in action not only a telegraphic instrument but also the electromagnetic tapper, which was arranged so as to administer light blows on the under side of the sensitive tube when the latter passed into the conductive condition.
Lodge arranged a mechanical tapper for the purpose which continually administered the small blow to the tube sufficient to keep the filings in a sensitive condition.
Popoff employed an electromagnetic tapper, in fact the mechanism of an electric bell with the gong removed, for this purpose.
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.
The numerous adjustments required by the tapper and the inertia of the apparatus prompted inventors to seek for a self-restoring coherer which should not need tapping.
Do you remember Tapper, Berzerk and Missile Command?
You can play some harder to find games like Tapper, Zaxxon and Street Fighter.
A 2005 show called "Classical Savion" found the tapper dancing along with music from Bach and Vivaldi, with a bit of Coltrane thrown in for good measure.
Perhaps most importantly, tap renews the spirit, putting a smile on the face of not only the tapper, but everyone who gets the opportunity to see this timeless dance performed.
Tattoo artists use high speed, magnetically powered tattoo guns to move the needle into the skin instead of a single needle with a tapper or mallet.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.