 In 1810 , an inn was founded ; and during the Industrial Revolution , roads , paths , a harbour , accommodation , a forge , blacksmiths , a brewery , a bakery and a prison were built to cater for the largest number of inhabitants since prehistoric times . Most were quarrymen working in new granite quarries . Several quarries can still be seen at present , such as on the Common . When the Prince and Princess Blücher leased the island from the British government during the First World War , he introduced a colony of Red @-@ necked wallabies to the island , around 60 @-@ 70 in number . They increased up to the First World War , after which they decreased in numbers , and the remaining few were re @-@ captured and put in enclosures . 
