Quakers started the British campaign against the slave trade and invented modern campaigning, championing the petition and the consumer boycott, and mastering the use of images and logos. Not that they like to shout about it. It is perhaps the defining image of the battle to end the slave trade. Not a picture of a shackled slave, or some gruesome punishment, but a cross-section of a ship. It is a ship packed so full that the mind boggles at the sheer logistics of inhumanity. The engraving of the Brookes, fully-loaded, slave ship The use of the engraving of the...