The literature which deals specially with cranes is not a large one, but there are some good German text-books on the subject, amongst which may be mentioned Die Hebezeuge by Ernst (4th ed., Berlin, 1903), and Cranes, by Anton Bottcher, translated with additions by A.
Bottcher, Das Leben Dr Johann Gerhards, in 1858.
C. C. Hoffmeister, Historisch-genealogisches Handbuch fiber alle Grafen and Fiirsten von Waldeck seit 1228 (Cassel, 1883); Bottcher, Das Staatsrecht des Furstentums Waldeck (Freiburg, 1884); A.
Bottcher) that the extent and nature of Livy's agreement with Polybius in this part of his work point rather to the use by both of a common original authority.
Bottcher, and W.