Of particular interest are the pages on gliders and flying machines. Most of Leonardo's aerial machines were designed after he studied birds. For this reason they generated their forward motion by mechanisms designed to flap the wings. In his notes he recorded, 'the bird is an instrument functioning according to mathematical laws, and man has the power to reproduce an instrument like this with all its movements.'

He built a working model of one of his flying machines and on January 2, 1496, he recorded in his notes that he was going to attempt to fly it the next day. It is unknown whether he didn't try or if the flight was a failure. Later on he did make a note to himself to try any more flying experiments over a lake where he would be less likely to be injured in a landing. Atlanticus also contains a design for a parachute which might have been conceived to allow for the safe escape of any pilot from a flying device.

A giant crossbow found in Codex Atlanticus

Leonardo's man-powered flight designs, though ingenious, would never have worked. A man cannot generate enough energy with his muscles to lift himself and a flying machine off the ground without the use of very high efficiency designs and materials made possible by modern technology. If Leonardo had concentrated more on building a glider, rather than a powered flying machine, he might have been much more successful in getting off the ground.

Atlanticus also contains a number of military designs including those for a giant crossbow and a compact version of a wooden spring catapult designed to hurl boulders. There were also siege machines created to defeat city walls and span moats and designs for castles and fortifications.

Codex Arundel - This book resides in the British Library in London and is one of the ones created by the cutting and pasting of pages from other works. Most of the material deals with the study of geometry, weights and architecture and the pages seem to have been authored between 1480 and 1518. Among other items, the Arundel document contains a design for a primitive tank that resembles a flying saucer as well as plans for an underwater diving bell.

Codices of the Institute of France - These are twelve documents (referred to as A-M) of varying sizes that cover a variety of areas including hydraulics, military art, optics, geometry and bird flight. One of Leonardo's most well known-designs, a primitive helicopter, is included

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A man-powered helicopter designed by Leonardo da Vinci

in manuscript B. The device was designed to be operated by four men. The men would never have had the strength necessary to create sufficient lift, but if a suitable engine had been substituted it might have actually gotten off the ground.

Codex Trivulzianus - There are only 55 pages in this document currently held in Milan. The subjects of this collection include religion, architecture and literature. It is thought the pages in this work were composed between 1487 and 1490.

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Codex 'On the Flight of Birds' - This short work of only 17 pages is a very careful study Leonardo did in 1505 on the mechanics of flight and the movement of air.

Codex Ashburnham - This is actually composed of two documents held by the Institute of France. It primarily consists of pictorial studies drawn between 1489 and 1492.

Codex Forster - These are three different documents held at the Victoria and Albert Museum in London. They are composed of studies about geometry, weights and hydraulic machines. Written between 1490 and 1505,

An early version of a tank found in Codex Arundel.

Codex Leicester - This manuscript was in the news when it was purchased by Bill Gates in 1995 for $30.8 million. It contains 64 pages mostly dedicated to Leonardo's theories on astronomy, the properties of water, rocks and fossils, air and celestial light. It is currently exhibited in the Seattle Museum of Art.

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Windsor Royal Documents - These pages are part of the royal collection at Windsor Castle. The subjects include anatomy and geography, horse studies, drawings, caricatures and a series of maps. There are about 600 unbound pages created between 1478 and 1518.

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The Madrid Codices - These manuscripts were found in the archives of the National Library of Madrid. There are two volumes bound in red morocco leather and contain 197 pages on geometry and mechanics.