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Of ancient Greek authors who have left us accounts of these engines, Heron (284–221 B.C.) and Philo (about 200B.C.) are the most trustworthy. Both these mechanicians give plans and dimensions with an accuracy that enables us to reconstruct the machines, if not with exactitude at any rate with sufficient correctness for practical application. Though in the books of Athenæus, Biton, Apollodorus, Diodorus, Procopius, Polybius and Josephus we find incomplete descriptions, these authors, especially Josephus, frequently allude to the effects of the engines in warfare; and scanty as is the knowledge they impart, it is useful and explanatory when read in conjunction with the writings of Heron and Philo. Among the Roman historians and military engineers, Vitruvius and Ammianus are the best authorities. Vitruvius copied his descriptions from the Greek writers, which shows us that the Romans adopted the engines from the Greeks. Of all the old authors who have described the engines, we have but copies of the original writings. It is therefore natural that we should come across many phrases and drawings which are evidently incorrect, as a result of repeated transcription, and which we know to be at fault though we cannot actually prove them to be so. With few exceptions, all the authors named simply present us with their own ideas when they are in doubt respecting the mechanical details and performances of the engines they wish to describe. All such spurious information is, of course, more detrimental than helpful to our elucidation of their construction and capabilities. It frequently happens that in a mediæval picture of one of these machines some important mechanical detail is omitted, or, from the difficulty of portraying it correctly, is purposely concealed by figures of soldiers, an omission that may be supplied by reference to other representations of the same weapon.
Military institutions and methods of warfare in the non-Western world from antiquity through the early 20th century provide the chief subjects of this annotated bibliography of works published before 1967, supplementing an earlier volume covering works published 1967–1997.
Filled with anecdotes, plans, photographs, drawings and detailed descriptions of the workings and history of all the major types of catapults, these pages will help readers get started in this fascinating hobby of harnessing the power and energy of simple and ancient machines, then using them to hurl all sorts of silly things into the air just to watch them splat.
The Gunpowder Epic is one of three planned publications on military technology within Dr Needham's immense undertaking. The discovery of gunpowder in China by the 9th century AD was followed by its rapid applications. It is now clear that the whole development from bombs and grenades to the invention of the metal-barrel hand gun took place in the Chinese culture area before Europeans had any knowledge of the mixture itself. Uses in civil engineering and mechanical engineering were equally important, before the knowledge of gunpowder spread to Europe in the thirteenth and fourteenth centuries. Dr Needham's new work continues to demonstrate the major importance of Chinese science and technology to world history and maintains the tradition of one of the great scholarly works of the twentieth century.