Between 1858 and 1863, he, and a team of assistants, extracted data from hundreds of ship logbooks that was then analysed to find the best route of maximum speed and safety for sailing ships travelling between Europe and Australia.[1] To obtain the logbooks he placed advertisements in the Victorian Government Gazette, and posted signs at the Melbourne Customs House, requesting the masters of arriving vessels to deposit their logbooks at his offices in the Flagstaff Observatory with a promise they would be returned within four days. More than 600 logs were examined and the information extracted was analysed and the conclusions published in the second half of a book published in 1864.[2]