History - British History in depth: The Abolition of British Slavery - Interactive Map. Josiah Wedgwood's design was reproduced on pottery and medallions, which were widely distributed and became the most easily recognisable image of the campaign. James expresses his shock at how slaves were treated. A freed slave helped raise awarness through his book. Thomas Philips - Slave-ship Captain discusses how he did not want to treat slaves badly like other captains.... Society for the Abolition of the Slave Trade. Thomas Clarkson.