From the mundane to the fantastic, from simple geometric patterns to elaborate mythological beasts, this fascinating work by Terence Wise explores the origins and appearance of medieval heraldic devices in an engagingly readable style ...

Low- or no-flow electron emitters are required for low-power electric thrusters, spacecraft plasma contactors, and electrodynamic tether systems to reduce or eliminate the need for propellant/expellant.

Well-balanced, carefully reasoned study covers such topics as Ptolemaic theory, work of Copernicus, Kepler, Newton, Eddington's work on stars, much more. Illustrated. References.

This is an anthology of writings by the architectural critic Kenneth Frampton.

While studying advanced physics at a prestigious European university, Elisa Robledo was invited to join a select research team on a secret project to manipulate String Theory.

The books are available in print, as well as ebooks. DigiCat hopes you will treat this work with the acknowledgment and passion it deserves as a classic of world literature.

Masterpiece of historical insight and scientific accuracy and the definitive work on Greek astronomy and the Copernican Revolution. Includes surveys of European and Islamic cosmologies of the Middle Ages and the Renaissance.