Overend, William Heysham (1851-98) (after); British. Medium: engraving. Date: 1881. Under the name the 'preventative squadron' the British Navy patrolled the East African coast in an attempt to prevent the traffic of slaves between East Africa and Asia'; The HMS London was stationed in Zanzibar between 1878 and 1883 as part of this squadron; A dhow is a particular sort of ship that is characteristic of Zanzibar and was frequently used by slave traders; Provenance: Private Collection. Photographic Rights The Bridgeman Art Library.