Thomas Clarkson 
The History of the Rise, Progress and Accomplishment of the Abolition of African Slave-Trade by the British Parliament [EPUB ebook] 

‘The History of the Rise, Progress and Accomplishment of the Abolition of African Slave-Trade by the British Parliament ‘ contains a unique contemporary account of the abolition movement in the Great Britain from one of its major leaders, Thomas Clarkson. In his book, Clarkson describes thoroughly the Quaker background to the abolitionist movement and the parliamentary debates leading to the Slave Trade Act of 1807.
Thomas Clarkson (1760-1846) was an English abolitionist, and a leading campaigner against the slave trade in the British Empire. He helped found The Society for Effecting the Abolition of the Slave Trade and helped achieve passage of the Slave Trade Act of 1807, which ended British trade in slaves.