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A buzzer or beeper is an audio signaling device, [1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices , timers , train and confirmation of user input such as a mouse click or keystroke.
The Danish physicist Valdemar Poulsen creates the world's first magnetic recording and reproduction, using a 1 mm thick steel wire as a magnetizable carrier. Nikola Tesla publicly demonstrated the first wireless remote control of a model ship. 1899: The dog "Nipper" is used in "His Master's Voice", the trademark for gramophones and records.
The brothers tossed a coin to decide who would get the first chance at piloting, and Wilbur won. The airplane left the rail, but Wilbur pulled up too sharply, stalled, and came down after covering 105 ft (32 m) in 3 1 ⁄ 2 seconds, sustaining little damage. [6] [13] Repairs after the abortive first flight took three days.
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One of the earliest books in existence is expected to fetch upwards of $2.6m when it goes up for auction later this year. One of world’s earliest known books expected to fetch more than $2.6m at ...
The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
Salisbury Cathedral clock, dating from about 1386, is one of the oldest working clocks in the world, and may be the oldest; it still has most of its original parts. [106] [note 5] The Wells Cathedral clock, built in 1392, is unique in that it still has its original medieval face. Above the clock are figures which hit the bells, and a set of ...
Lawrence A. "Pat" Hyland (August 26, 1897 – November 24, 1989) was an American electrical engineer.He is one of three individuals who are credited with major contributions to the invention of radar, but is probably best known as the man who transformed Hughes Aircraft from Howard Hughes' aviation "hobby shop" into one of the world's leading technology companies.