original_query: What is the significance of Hydraulic Engine House and Crane Bases Nos. 7, 8, 9, and 10 in relation to the transfer of hydraulic technology from the UK to NSW in the nineteenth century?
query: What is the significance of the Hydraulic Engine House and Crane Bases Nos. 7, 8, 9, and 10 in relation to the transfer of hydraulic technology from the UK to NSW in the nineteenth century?
answer: The Hydraulic Engine House and Crane Bases are significant for yielding scientific and archaeological information about the 19th-century transfer of hydraulic technology from the UK to NSW.