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A heliograph (from Greek ἥλιος (helios) ‘sun’ and γράφειν (graphein) ‘write’) is a semaphore system that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. The flashes are produced by momentarily pivoting the mirror or by interrupting the beam with a shutter.
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What era was 1839?
1839 (MDCCCXXXIX) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar the 1839th year of the Common Era (CE) and Anno Domini (AD) designations the 839th year of the 2nd millennium the 39th year of the 19th century and the 10th and last year of …
Who invented dynamite?
Alfred NobelSwedish chemist inventor engineer entrepreneur and business man Alfred Nobel had acquired 355 patents worldwide when he died in 1896. He invented dynamite and experimented in making synthetic rubber leather and artificial silk among many other things.
What war happened in 1848?
The Mexican-American WarThe Mexican-American War was a conflict between the United States and Mexico fought from April 1846 to February 1848.
What happened in the world in 1848?
Revolutions of 1848 series of republican revolts against European monarchies beginning in Sicily and spreading to France Germany Italy and the Austrian Empire. They all ended in failure and repression and were followed by widespread disillusionment among liberals.
Why was 1848 an important year?
The year 1848 was initially envisaged because of its importance as the year of revolutions that helped to create the political landscape of modern Europe: the rising political and economic power of the middle classes. liberalism and political democracy. … the beginning of the end for the multinational European empires.
What happened April 1939?
April 28 1939 (Friday)
Hitler made a speech to the Reichstag renouncing the Anglo-German Naval Agreement and German–Polish declaration of non-aggression yet offered to negotiate new non-aggression pacts with any nations that asked for them.
What was happening in June 1939?
June 23 1939 (Friday)
France and Turkey signed a mutual assistance pact. France renounced all claims to the Republic of Hatay while Turkey promised aid to France in the event of aggression. Bronko Nagurski defeated Lou Thesz in Houston Texas to win the National Wrestling Association World Heavyweight Championship.
What WW2 events happened in 1940?
WW2: Key Events
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