HISTORICAL PERSPECTIVE Flashcards
Used to convey messages from about 700 B.C.E.
Carrier pigeons
It is where the first long-distance communication
systems were based on (e.g. drums and horns,
smoke signals and beacon fires).
signals of sound and light
_________ alerted the British of the arrival of the
Spanish Armada in _______ C.E.
Signal Fires, 1588
The Chinese used _______ as signals to warn of an
imminent attack on the ___________.
rockets, Great Wall
Native Americans communicated by covering and
uncovering a ________ with a blanket to produce ____________ or by beating _____.
bonfire, smoke signals, drums
The British Navy sent signals at night by raising and
lowering a _______, which coincidentally was the same way _________ was signaled with news of the arrival of the British.
lantern, Paul Revere
In instances when clear vision was difficult (e.g., fog),
______ or ______ and ________ sent signals.
bellS, whistleS, fired weaponS
Used in traditional long-distance communication until almost 1800
horse-mounted dispatch riders
_________________ developed an __________________ (semaphore) system of stations built on rooftops or _______ that were visible from a great distance in year _________.
Frenchman Claude Chappe, optical telegraph, towers, 1793
Each semaphore station consisted of a column-like _______ with a moveable ______. Attached to the beam were two moveable ________.
tower, beam, arms
In a sempahore, the beam and arms were swiveled with ______, conveying different signal patterns representing upper- and lowercase _______, _________ marks, and __________. A set of patterns was translated into words by an _________ at another station, who then sent it on to the next station.
ropes, letters, punctuation, numbers, observer
Semaphore, This system allowed the ______ to send a concise message over _____ miles (160 km) in less than ____ min as long as visibility was good.
French, 100, 5
_____________ developed another type of optical telegraph system
with ten collapsible _____________, which when placed in various positions formed combinations of numbers that were translated into ________, _________, or _______. _______ semaphore systems were also used in Boston, New York City, and San Francisco at that time.
SWEDE A. N. EDELCRANTZ, iron shutters, letters, words, phrases, crude
________________ transmitted the first practical ___________ in ______, by sending electricity through a long set of wires to produce ______________ that was used to ring a bell.
Joseph Henry, electrical signal,1830, electromagnetism
____________ patented the first functional electrical ______________ system in ______: the electric telegraph with its system of electrical ________ identified as ______ and ______ that eventually became known as Morse Code.
Samuel Morse, communication, 1831, impulses, dots, dashes