why is this language named as 'martha vineyard'?
It was once widely used by both Deaf and hearing people on the island of Martha's Vineyard
Martha's Vineyard Sign Language
once widely used on the island of Martha's Vineyard 
american sign language was brought to america from which country Spain how is this particular type of mentioned language expressed? ASL signs have a number of phonemic components, such as movement of the face, the torso, and the hands. ASL is not a form of pantomime although iconicity plays a larger role in ASL than in spoken languages. is this particular type of mentioned language expressed only in the united states or in other parts of the world too? West African countries, Barbados, Bolivia, Cambodia, the Central African Republic, Chad, China (Hong Kong), the Democratic Republic of the Congo, Gabon, Jamaica, Kenya, Madagascar, the Philippines, Singapore, and Zimbabwe. are there any varieties of this particular type of mentioned language? Varieties of ASL are found throughout the world. Mutual intelligibility among those ASL varieties is high, and the variation is primarily lexical. is there someone in the historical days who is responsible for developing this language for the deaf? Francisco Vásquez de Coronado who is the person? Spanish explorer what are some of the examples of dialects that evolved from this particular type of mentioned language? A "triangle" of village sign languages developed. One in Martha's Vineyard, Massachusetts; one in Henniker, New Hampshire, and one in Sandy River Valley, Maine. Martha's Vineyard Sign Language (MVSL), which was particularly important for the history of ASL, was used mainly in Chilmark, Massachusetts.
wiki:19139534
Martha's Vineyard Sign Language [SEP] Introduction
Martha's Vineyard Sign Language (MVSL) was a village sign-language that was once widely used on the island of Martha's Vineyard from the early 18th century to 1952. It was used by both Deaf and hearing people in the community; consequently, deafness did not become a barrier to participation in public life. Deaf people who signed Martha's Vineyard Sign Language were extremely independent. They participated in society as typical citizens, although there were incidents of discrimination, and language barriers. The language was able to thrive because of the unusually high percentage of Deaf islanders and because deafness was a recessive trait, which meant that almost anyone might have both Deaf and hearing siblings.