Robert Hugh Layton extend their maker's or user's agency. While studying Australian rock art Robert Layton helped prepare a number of Aboriginal Land Claims, of which the first was the claim to the Uluru National Park. This research has been published in his books "Uluru: An Aboriginal history of Ayers Rock" (Aboriginal Studies Press, Canberra, 1986 reissued 2001) and Australian rock art, a new synthesis (Cambridge University Press 1992). He has revisited Australia several times, working on the Hodgson Downs land claim in 1993-4 and helping to prepare the Australian Government's submission to UNESCO to place the Uluru National Park on the World
Local attraction Local attraction While compass surveying, the magnetic needle is sometimes disturbed from its normal position under the influence of external attractive forces. Such a disturbing influence is called as local attraction. The external forces are produced by sources of local attraction which may be current carrying wire (magnetic materials) or metal objects. The term is also used to denote amount of deviation of the needle from its normal position. It mostly causes errors in observations while surveying and thus suitable methods are employed to neglect these errors. The sources of local attraction may be natural or artificial. Natural sources include