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Among the famous communication drums are the drums of West Africa (see talking drum). From regions known today as Nigeria and Ghana they spread across West Africa, and to the America and the Caribbean during the slave trade. There they were banned because they were being used by the slaves to communicate over long distances in a code unknown to ...
Ngoma drum in German East Africa in 1906. Ngoma (also called engoma or ng'oma or ingoma) are musical instruments used by certain Bantu populations of Africa. Ngoma is derived from the Kongo word for "drum". Different Bantu-inhabited regions have their own traditions of percussion, with different names for their instruments.
The history of navigation, or the history of seafaring, is the art of directing vessels upon the open sea through the establishment of its position and course by means of traditional practice, geometry, astronomy, or special instruments.
These vessels were well-suited for the conditions of the Indian Ocean, enabling long-distance trade. The techniques used in dhow construction were passed down through generations, reflecting a deep understanding of maritime engineering and navigation. Dhows remain a symbol of the rich maritime heritage of the Swahili Coast. [1] [12] [13]
Quadrant A very simple instrument which used a plumb bob. These instruments are also used to measure the angular distance between objects: Octant, invented in 1731. The first widely accepted instrument that could measure an angle without being strongly affected by movement. Sextant, derived from the octant in 1757, eventually made all previous ...
Polyphonic wind ensembles: common throughout sub-Saharan Africa, ranging to West Africa to East Africa, and all the way down to South Africa. Typically wind and percussion instruments (usually flutes, drums, and iron bells in Cameroon), which are played by men in egalitarian societies. Women do not play instruments and only sing if participating.
An English emigrant to Africa, John F. Carrington, in his 1949 book The Talking Drums of Africa, explained how African drummers were able to communicate complex messages over vast distances. [23] Using low tones referred to as male and higher female tones, the drummer communicates through the phrases and pauses, which can travel upwards of 4 ...
The Decca Navigator System was a hyperbolic radio navigation system that allowed ships and aircraft to determine their position by using radio signals from a dedicated system of static radio transmitters. The system used phase comparison between pairs of low frequency signals between 70 and 129 kHz, as opposed to pulse timing systems like Gee ...